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c_ijaze948pqlx | In materials science and engineering, the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed. Once the yie... | Yield (engineering) | [
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c_vqqynzprzsqy | These are called viscous stresses. For instance, in a fluid such as water the stresses which arise from shearing the fluid do not depend on the distance the fluid has been sheared; rather, they depend on how quickly the shearing occurs. Viscosity is the material property which relates the viscous stresses in a material... | Viscous forces | [
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c_ku0ocgn6kwj6 | However, the Greek letter eta ( η {\displaystyle \eta } ) is also used by chemists, physicists, and the IUPAC. The viscosity μ {\displaystyle \mu } is sometimes also called the shear viscosity. However, at least one author discourages the use of this terminology, noting that μ {\displaystyle \mu } can appear in non-she... | Viscous forces | [
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c_l4bajc6e2xyu | In shearing flows with planar symmetry, it is what defines μ {\displaystyle \mu } . It is a special case of the general definition of viscosity (see below), which can be expressed in coordinate-free form. Use of the Greek letter mu ( μ {\displaystyle \mu } ) for the dynamic viscosity (sometimes also called the absolute... | Viscous forces | [
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c_ag1a3gixg745 | In massively multiplayer online games, an instance is a special area, typically a dungeon or a restricted dungeon-like environment, that generates a new copy of the location for each group or certain number of players that enters the area. Instancing, the general term for the use of this technique, addresses several pr... | Dungeon crawler | [
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c_mjaigj2neew7 | In massively multiplayer online games and other types of online game, the other human-controlled players give the gameplay a greater variety than permitted by the AI of computer-controlled bots, as well as allowing chatting and other interaction between players, thus increasing the length of time the player will spend ... | Replay value | [
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c_mitkwrg2f0fq | In massive stars, the core is already large enough at the onset of the hydrogen burning shell that helium ignition will occur before electron degeneracy pressure has a chance to become prevalent. Thus, when these stars expand and cool, they do not brighten as dramatically as lower-mass stars; however, they were more lu... | Stellar death | [
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c_domjygdl6mwa | In markets that are restricted and that have constant changes. An alliance can increase competitiveness because the partner can understand and adapt to the market. | Cooperative strategy | [
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c_tebovpzmp0ma | In mass spectrometry, direct analysis in real time (DART) is an ion source that produces electronically or vibronically excited-state species from gases such as helium, argon, or nitrogen that ionize atmospheric molecules or dopant molecules. The ions generated from atmospheric or dopant molecules undergo ion-molecule ... | Direct analysis in real time | [
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c_qi6jbggg4xnc | This ionization can occur for species desorbed directly from surfaces such as bank notes, tablets, bodily fluids (blood, saliva and urine), polymers, glass, plant leaves, fruits & vegetables, clothing, and living organisms. DART is applied for rapid analysis of a wide variety of samples at atmospheric pressure and in t... | Direct analysis in real time | [
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c_psnbvg67hmor | However, there are also a number of special cases that need to be considered where the rate of crack growth is significantly different compared to that obtained from constant amplitude testing. Such as the reduced rate of growth that occurs for small loads near the threshold or after the application of an overload; and... | Material fatigue | [
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c_6sbp4o73ob4y | In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typically producing striations on some parts of the fracture surface. The crack will continue to grow until it reaches a cri... | Material fatigue | [
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c_14tg3eovj75z | In the nineteenth century, the sudden failing of metal railway axles was thought to be caused by the metal crystallising because of the brittle appearance of the fracture surface, but this has since been disproved. Most materials, such as composites, plastics and ceramics, seem to experience some sort of fatigue-relate... | Material fatigue | [
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c_nrfolko842ze | Metal foams typically retain some physical properties of their base material. Foam made from non-flammable metal remains non-flammable and can generally be recycled as the base material. Its coefficient of thermal expansion is similar while thermal conductivity is likely reduced. | Sponge metal | [
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c_7seh4dowrbip | In materials science, a metal foam is a material or structure consisting of a solid metal (frequently aluminium) with gas-filled pores comprising a large portion of the volume. The pores can be sealed (closed-cell foam) or interconnected (open-cell foam). The defining characteristic of metal foams is a high porosity: t... | Sponge metal | [
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c_ap39dd5tc9tf | In materials science, a grain boundary is the interface between two grains, or crystallites, in a polycrystalline material. Grain boundaries are two-dimensional defects in the crystal structure, and tend to decrease the electrical and thermal conductivity of the material. Most grain boundaries are preferred sites for t... | Grain boundary | [
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c_v02rdfkm7o3s | In materials science, cross slip is the process by which a screw dislocation moves from one slip plane to another due to local stresses. It allows non-planar movement of screw dislocations. Non-planar movement of edge dislocations is achieved through climb. Since the Burgers vector of a perfect screw dislocation is par... | Cross Slip | [
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c_slmiaaswt38y | Therefore, a screw dislocation can glide or slip along any plane that contains its Burgers vector. During cross slip, the screw dislocation switches from gliding along one slip plane to gliding along a different slip plane, called the cross-slip plane. The cross slip of moving dislocations can be seen by transmission e... | Cross Slip | [
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c_g0ocinkmet3r | In materials science, Schmid's law (also Schmid factor) describes the slip plane and the slip direction of a stressed material, which can resolve the most shear stress. Schmid's Law states that the critically resolved shear stress (τ) is equal to the stress applied to the material (σ) multiplied by the cosine of the an... | Schmid's law | [
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c_3kedh42o455y | In materials science, grain-boundary strengthening (or Hall–Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size. It is based on the observation that grain boundaries are insurmountable borders for dislocations and that the number of dislocations within a grain ... | Grain refining | [
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c_vfqjxuoxrnu3 | This is of concern to both the pharmaceutical and computer hardware industry, where disappearing polymorphs can ruin the effectiveness of their products, and make it impossible to manufacture the original product if there is any contamination. There have been cases of laboratories growing crystals of a particular struc... | Disappearing polymorphs | [
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c_8mzqrloj58wc | The drug paroxetine was subject to a lawsuit that hinged on such a pair of polymorphs, and multiple life-saving drugs, such as ritonavir, have been recalled due to unexpected polymorphism. Although it may seem like a so-called disappearing polymorph has disappeared for good, it is believed that it is always possible in... | Disappearing polymorphs | [
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c_rw1nir3lr1lz | In materials science, disappearing polymorphs (or perverse polymorphism) describes a phenomenon in which a seemingly stable crystal structure is suddenly unable to be produced, instead transforming into a polymorph, or differing crystal structure with the same chemical composition, during nucleation. Sometimes the resu... | Disappearing polymorphs | [
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c_6eyyzok7zwt3 | In materials science, a Bingham plastic is a viscoplastic material that behaves as a rigid body at low stresses but flows as a viscous fluid at high stress. It is named after Eugene C. Bingham who proposed its mathematical form.It is used as a common mathematical model of mud flow in drilling engineering, and in the ha... | Bingham fluid | [
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c_dlq4xcvmicpx | Layers of different materials may be used, resulting in a hybrid laminate. The individual layers generally are orthotropic (that is, with principal properties in orthogonal directions) or transversely isotropic (with isotropic properties in the transverse plane) with the laminate then exhibiting anisotropic (with varia... | Composite laminate | [
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c_j33ili95wary | In materials science, a composite laminate is an assembly of layers of fibrous composite materials which can be joined to provide required engineering properties, including in-plane stiffness, bending stiffness, strength, and coefficient of thermal expansion. The individual layers consist of high-modulus, high-strength... | Composite laminate | [
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c_7rjtdrk6q0ge | In materials science, fragile matter is a granular material that is jammed solid. Everyday examples include beans getting stuck in a hopper in a whole food shop, or milk powder getting jammed in an upside-down bottle. The term was coined by physicist Michael Cates, who asserts that such circumstances warrant a new clas... | Fragile matter | [
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c_neh0jm46anyr | Shaving foam is jammed because the bubbles are tightly packed together under the isotropic stress imposed by atmospheric pressure. If it were a fragile solid, it would respond plastically to shear stress, however small. But because bubbles deform, foam actually responds elastically provided that the stress is below a t... | Fragile matter | [
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c_q8gf01z9z1th | Perhaps the simplest example is a pile of sand, which is solid in the sense that the pile sustains its shape despite the force of gravity. Slight tilting or vibration is enough to enable the grains to shift, collapsing the pile. Not all jammed systems are fragile, i.e. foam. | Fragile matter | [
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c_v4i4u87rzmfb | In materials science, material failure is the loss of load carrying capacity of a material unit. This definition introduces to the fact that material failure can be examined in different scales, from microscopic, to macroscopic. In structural problems, where the structural response may be beyond the initiation of nonli... | Material failure theory | [
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c_rtib2ea2o48d | In materials science, an interstitial defect is a type of point crystallographic defect where an atom of the same or of a different type, occupies an interstitial site in the crystal structure. When the atom is of the same type as those already present they are known as a self-interstitial defect. Alternatively, small ... | Interstitial defect | [
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c_bnzgykpfx0aj | Many of their important properties can only be rationalized by considering them to be porous media. The concept of porous media is used in many areas of applied science and engineering: filtration, mechanics (acoustics, geomechanics, soil mechanics, rock mechanics), engineering (petroleum engineering, bioremediation, c... | Porous media | [
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c_51tu1z1subgt | In materials science, a porous medium or a porous material is a material containing pores (voids). The skeletal portion of the material is often called the "matrix" or "frame". The pores are typically filled with a fluid (liquid or gas). The skeletal material is usually a solid, but structures like foams are often also... | Porous media | [
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c_m2zhsq2mnhzg | A porous medium is most often characterised by its porosity. Other properties of the medium (e.g. permeability, tensile strength, electrical conductivity, tortuosity) can sometimes be derived from the respective properties of its constituents (solid matrix and fluid) and the media porosity and pores structure, but such... | Porous media | [
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c_3b1vn3avkyuv | In materials science and mathematics, functionally graded elements are elements used in finite element analysis. They can be used to describe a functionally graded material. | Functionally graded element | [
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c_ma8k99djtwlh | In materials science and solid mechanics, biaxial tensile testing is a versatile technique to address the mechanical characterization of planar materials. It is a generalized form of tensile testing in which the material sample is simultaneously stressed along two perpendicular axes. Typical materials tested in biaxial... | Biaxial tensile testing | [
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c_xp41oa9rep59 | For soft materials, such as rubber, where the bulk modulus is much higher than the shear modulus, Poisson's ratio is near 0.5. For open-cell polymer foams, Poisson's ratio is near zero, since the cells tend to collapse in compression. Many typical solids have Poisson's ratios in the range of 0.2–0.3. The ratio is named... | Poisson's Ratio | [
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c_qyuobu389ojo | In materials science and solid mechanics, Poisson's ratio ν {\displaystyle \nu } (nu) is a measure of the Poisson effect, the deformation (expansion or contraction) of a material in directions perpendicular to the specific direction of loading. The value of Poisson's ratio is the negative of the ratio of transverse str... | Poisson's Ratio | [
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c_f2f2ygp7iivd | Polymorphism is of practical relevance to pharmaceuticals, agrochemicals, pigments, dyestuffs, foods, and explosives. According to IUPAC, a polymorphic transition is "A reversible transition of a solid crystalline phase at a certain temperature and pressure (the inversion point) to another phase of the same chemical co... | Polymorphism (crystallography) | [
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c_5zetk9bdmk95 | In materials science, polymorphism describes the existence of a solid material in more than one form or crystal structure. Polymorphism is a form of isomerism. Any crystalline material can exhibit the phenomenon. Allotropy refers to polymorphism for chemical elements. | Polymorphism (crystallography) | [
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c_ejttcxg02urb | In materials science and materials engineering, uranium metallurgy is the study of the physical and chemical behavior of uranium and its alloys.Commercial-grade uranium can be produced through the reduction of uranium halides with alkali or alkaline earth metals. Uranium metal can also be made through electrolysis of K... | Uranium metallurgy | [
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c_gbgoq1wz4nx8 | The uranium isotope 235U is used as the fuel for nuclear reactors and nuclear weapons. It is the only isotope existing in nature to any appreciable extent that is fissile, that is, fissionable by thermal neutrons. The isotope 238U is also important because it absorbs neutrons to produce a radioactive isotope that subse... | Uranium metallurgy | [
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c_lncffwrhxz5n | In materials science, radiation-absorbent material (RAM) is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as many incident directions as possible. The more effective the RAM, the lower the resulting level ... | Radar absorbent material | [
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c_fj6jqqd3rg0t | In materials science, liquefaction is a process that generates a liquid from a solid or a gas or that generates a non-liquid phase which behaves in accordance with fluid dynamics. It occurs both naturally and artificially. As an example of the latter, a "major commercial application of liquefaction is the liquefaction ... | Liquefaction | [
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c_8f4d6ebfddup | In materials science, a polymer blend, or polymer mixture, is a member of a class of materials analogous to metal alloys, in which at least two polymers are blended together to create a new material with different physical properties. | Polymer blend | [
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c_96r1cilho69z | In materials science, a polymer matrix composite (PMC) is a composite material composed of a variety of short or continuous fibers bound together by a matrix of organic polymers. PMCs are designed to transfer loads between fibers of a matrix. Some of the advantages with PMCs include their light weight, high resistance ... | Polymer matrix composite | [
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c_ngsgt2px6ugq | Unstable polymorphs more closely resemble the state in solution, and thus are kinetically advantaged. For example, out of hot water, metastable, fibrous crystals of benzamide appear first, only later to spontaneously convert to the more stable rhombic polymorph. Another example is magnesium carbonate, which more readil... | Ostwald's step rule | [
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c_377itvvwzjxn | A dramatic example is phosphorus, which upon sublimation first forms the less stable white phosphorus, which only slowly polymerizes to the red allotrope. This is notably the case for the anatase polymorph of titanium dioxide, which having a lower surface energy is commonly the first phase to form by crystallisation fr... | Ostwald's step rule | [
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c_qk923btlx8nd | In materials science, Ostwald's rule or Ostwald's step rule, conceived by Wilhelm Ostwald, describes the formation of polymorphs. The rule states that usually the less stable polymorph crystallizes first. Ostwald's rule is not a universal law but a common tendency observed in nature.This can be explained on the basis o... | Ostwald's step rule | [
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c_gzad7z232jon | In materials science, a matrix is a constituent of a composite material. | Matrix (composite) | [
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c_s7fpivd2y251 | In materials science, a metal matrix composite (MMC) is a composite material with fibers or particles dispersed in a metallic matrix, such as copper, aluminum, or steel. The secondary phase is typically a ceramic (such as alumina or silicon carbide) or another metal (such as steel). They are typically classified accord... | Metal matrix composite | [
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c_krhjeus2aw6h | There is some overlap between MMCs and cermets, with the latter typically consisting of less than 20% metal by volume. When at least three materials are present, it is called a hybrid composite. MMCs can have much higher strength-to-weight ratios, stiffness, and ductility than traditional materials, so they are often u... | Metal matrix composite | [
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c_a3x6tnikqad8 | In materials science, and especially elasticity theory, ideas of torsion also play an important role. One problem models the growth of vines, focusing on the question of how vines manage to twist around objects. The vine itself is modeled as a pair of elastic filaments twisted around one another. In its energy-minimizi... | Torsion tensor | [
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c_zm9739l85qt3 | In materials science, a sandwich-structured composite is a special class of composite materials that is fabricated by attaching two thin-but-stiff skins to a lightweight but thick core. The core material is normally low strength, but its higher thickness provides the sandwich composite with high bending stiffness with ... | Sandwich structured composite | [
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c_19mfejse664o | Sometimes, the honeycomb structure is filled with other foams for added strength. Open- and closed-cell metal foam can also be used as core materials. Laminates of glass or carbon fiber-reinforced thermoplastics or mainly thermoset polymers (unsaturated polyesters, epoxies...) are widely used as skin materials. Sheet m... | Sandwich structured composite | [
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c_9sr92sq41td5 | In materials science, crystallographic texture (or preferred orientation) can be described using Euler angles. In texture analysis, the Euler angles provide a mathematical depiction of the orientation of individual crystallites within a polycrystalline material, allowing for the quantitative description of the macrosco... | Euler angle | [
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c_jig27zojm8he | While their fracture toughness remains unaltered, their threshold stress intensity factor for crack propagation may be considerably lowered. Consequently, they become prone to premature fracture because of sub-critical crack growth. This article aims to give a brief overview of the various degradation processes mention... | Environmental stress fracture | [
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c_n4sk1ke7unhq | In materials science, environmental stress fracture or environment assisted fracture is the generic name given to premature failure under the influence of tensile stresses and harmful environments of materials such as metals and alloys, composites, plastics and ceramics. Metals and alloys exhibit phenomena such as stre... | Environmental stress fracture | [
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c_zk1x7139hoas | Plastics and plastic-based composites may suffer swelling, debonding and loss of strength when exposed to organic fluids and other corrosive environments, such as acids and alkalies. Under the influence of stress and environment, many structural materials, particularly the high-specific strength ones become brittle and... | Environmental stress fracture | [
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c_5narggnme3rm | In materials science, hardness (antonym: softness) is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. In general, different materials differ in their hardness; for example hard metals such as titanium and beryllium are harder than soft metals such as so... | Hardness tester | [
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c_qhk1n9anhal8 | In materials science, permeance is the degree to which a material transmits another substance. | Permeance | [
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c_pkbc73cw5r42 | Generally, raising the temperature of an alloy above 0.5 Tm results in the plastic deformation mechanisms being controlled by strain-rate sensitivity, whereas at room temperature metals are generally strain-dependent. Other models may also include the effects of strain gradients. Independent of test conditions, the flo... | Flow stress | [
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c_47vg4o3gzr48 | Fatigue failure is caused by crack propagation in materials under a varying load, typically a cyclically varying load. The rate of crack propagation is inversely proportional to the flow stress of the material. == References == | Flow stress | [
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c_nom1cu1y47xe | In continuum mechanics, the flow stress for a given material will vary with changes in temperature, T {\displaystyle T} , strain, ε {\displaystyle \varepsilon } , and strain-rate, ε ˙ {\displaystyle {\dot {\varepsilon }}} ; therefore it can be written as some function of those properties: Y f = f ( ε , ε ˙ , T ) {\disp... | Flow stress | [
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c_ddo3ilxk88dc | Sufficiently high power of the laser beam can thus result in the removal of material at the interference maximums thanks to ablation phenomenon, leaving the material intact at the minimums. In this way, a repeatable pattern can be permanently fixed on the surface of a given material. DLIP can be applied to almost any m... | Direct laser interference patterning | [
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c_p1o2ryiyc8y5 | In materials science, direct laser interference patterning (DLIP) is a laser-based technology that uses the physical principle of interference of high-intensity coherent laser beams to produce functional periodic microstructures. In order to obtain interference, the beam is divided by a beam splitter, special prisms, o... | Direct laser interference patterning | [
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c_bok4fwdvuqfk | In materials science, paracrystalline materials are defined as having short- and medium-range ordering in their lattice (similar to the liquid crystal phases) but lacking crystal-like long-range ordering at least in one direction. | Paracrystallinity | [
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c_lo46a8chhh5y | In materials science and soil mechanics, a slip line field or slip line field theory is a technique often used to analyze the stresses and forces involved in the major deformation of metals or soils. In essence, in some problems including plane strain and plane stress elastic-plastic problems, elastic part of the mater... | Slip line field | [
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c_wcdee2ycfq4n | In materials science, a precipitate-free zone (PFZ) refers to microscopic localized regions around grain boundaries that are free of precipitates (solid impurities forced outwards from the grain during crystallization). It is a common phenomenon that arises in polycrystalline materials (crystalline materials with stoch... | Precipitate-free zone | [
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c_ydax6w2lp3or | In materials science and solid mechanics, residual stresses are stresses that remain in a solid material after the original cause of the stresses has been removed. Residual stress may be desirable or undesirable. For example, laser peening imparts deep beneficial compressive residual stresses into metal components such... | Residual stress | [
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c_fan1i9xqgeq2 | Residual stresses can result from a variety of mechanisms including inelastic (plastic) deformations, temperature gradients (during thermal cycle) or structural changes (phase transformation). Heat from welding may cause localized expansion, which is taken up during welding by either the molten metal or the placement o... | Residual stress | [
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c_k4dx0rdl37kb | Friction and wear originate at these points, and thus understanding their behavior becomes important when studying materials in contact. When the surfaces are subjected to a compressive load, the asperities deform through elastic and plastic modes, increasing the contact area between the two surfaces until the contact ... | Asperity (material science) | [
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c_hsygco26v77z | In materials science, asperity, defined as "unevenness of surface, roughness, ruggedness" (from the Latin asper—"rough"), has implications (for example) in physics and seismology. Smooth surfaces, even those polished to a mirror finish, are not truly smooth on a microscopic scale. They are rough, with sharp, rough or r... | Asperity (material science) | [
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c_pwvq8jf3f6kh | The fractal dimension of these structures has been correlated with the contact mechanics exhibited at an interface in terms of friction and contact stiffness. When two macroscopically smooth surfaces come into contact, initially they only touch at a few of these asperity points. These cover only a very small portion of... | Asperity (material science) | [
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c_y9wyv63v8ney | If the orientations are specified in terms of matrices of direction cosines gA and gB, then the misorientation operator ∆gAB going from A to B can be defined as follows: g B = Δ g A B g A Δ g A B = g B g A − 1 {\displaystyle {\begin{aligned}&g_{B}=\Delta g_{AB}g_{A}\\&\Delta g_{AB}=g_{B}g_{A}^{-1}\end{aligned}}} where ... | Misorientation | [
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c_2qodeogupy2i | In materials science, misorientation is the difference in crystallographic orientation between two crystallites in a polycrystalline material. In crystalline materials, the orientation of a crystallite is defined by a transformation from a sample reference frame (i.e. defined by the direction of a rolling or extrusion ... | Misorientation | [
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c_f9s5le2iga5s | In materials science and metallurgy, toughness is the ability of a material to absorb energy and plastically deform without fracturing. Toughness is the strength with which the material opposes rupture. One definition of material toughness is the amount of energy per unit volume that a material can absorb before ruptur... | Toughness | [
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c_u4b317ftg0t7 | In materials science, a partial dislocation is a decomposed form of dislocation that occurs within a crystalline material. An extended dislocation is a dislocation that has dissociated into a pair of partial dislocations. The vector sum of the Burgers vectors of the partial dislocations is the Burgers vector of the ext... | Partial dislocation | [
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c_k1r0et3uz9rr | In steel alloyed with metals such as nickel and manganese, the eutectoid temperature becomes much lower, but the kinetic barriers to phase transformation remain the same. This allows quenching to start at a lower temperature, making the process much easier. High-speed steel also has added tungsten, which serves to rais... | Quenching | [
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c_wnim5sel61tm | In materials science, quenching is the rapid cooling of a workpiece in water, oil, polymer, air, or other fluids to obtain certain material properties. A type of heat treating, quenching prevents undesired low-temperature processes, such as phase transformations, from occurring. It does this by reducing the window of t... | Quenching | [
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c_q8u0z7fmlaew | Cold working of metal increases the number of dislocations by the Frank–Read mechanism. Higher dislocation density increases yield strength and causes work hardening of metals. The mechanism of dislocation generation was proposed by and named after British physicist Charles Frank and Thornton Read. | Frank-Read source | [
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c_awaeu29i7eae | In materials science, a Frank–Read source is a mechanism explaining the generation of multiple dislocations in specific well-spaced slip planes in crystals when they are deformed. When a crystal is deformed, in order for slip to occur, dislocations must be generated in the material. This implies that, during deformatio... | Frank-Read source | [
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c_2nyerch6v99f | In materials science, grain growth is the increase in size of grains (crystallites) in a material at high temperature. This occurs when recovery and recrystallisation are complete and further reduction in the internal energy can only be achieved by reducing the total area of grain boundary. The term is commonly used in... | Grain growth | [
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c_4ji2mwly7rsu | In materials science, a general rule of mixtures is a weighted mean used to predict various properties of a composite material . It provides a theoretical upper- and lower-bound on properties such as the elastic modulus, ultimate tensile strength, thermal conductivity, and electrical conductivity. In general there are ... | Rule of mixtures | [
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c_khzz3a9z8iot | The real upper-bound Young's modulus is larger than E c {\displaystyle E_{c}} given by this formula. Even if both constituents are isotropic, the real upper bound is E c {\displaystyle E_{c}} plus a term in the order of square of the difference of the Poisson's ratios of the two constituents.The inverse rule of mixture... | Rule of mixtures | [
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c_kno4t2ajqon0 | On the other hand, imperfect single crystals can reach enormous sizes in nature: several mineral species such as beryl, gypsum and feldspars are known to have produced crystals several meters across.The opposite of a single crystal is an amorphous structure where the atomic position is limited to short-range order only... | Mono-crystalline silicon | [
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c_ak2uum6tzn69 | In materials science, a single crystal (or single-crystal solid or monocrystalline solid) is a material in which the crystal lattice of the entire sample is continuous and unbroken to the edges of the sample, with no grain boundaries. The absence of the defects associated with grain boundaries can give monocrystals uni... | Mono-crystalline silicon | [
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c_8qkunl6r4ftc | In materials science and molecular biology, thermostability is the ability of a substance to resist irreversible change in its chemical or physical structure, often by resisting decomposition or polymerization, at a high relative temperature. Thermostable materials may be used industrially as fire retardants. A thermos... | Thermostability | [
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c_bp5pvzggkfjr | In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening ("curing") a soft solid or viscous liquid prepolymer (resin). Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. Heat is not nece... | Thermosetting polymer | [
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c_tu6kv0zgzhx7 | The starting material for making thermosets is usually malleable or liquid prior to curing, and is often designed to be molded into the final shape. It may also be used as an adhesive. Once hardened, a thermoset cannot be melted for reshaping, in contrast to thermoplastic polymers which are commonly produced and distri... | Thermosetting polymer | [
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c_18weafanflo7 | In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe ... | Creep (deformation) | [
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c_2jjfflxqkd4j | For example, moderate creep in concrete is sometimes welcomed because it relieves tensile stresses that might otherwise lead to cracking. Unlike brittle fracture, creep deformation does not occur suddenly upon the application of stress. Instead, strain accumulates as a result of long-term stress. Therefore, creep is a ... | Creep (deformation) | [
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c_kt76n7irlh6w | Depending on the magnitude of the applied stress and its duration, the deformation may become so large that a component can no longer perform its function – for example creep of a turbine blade could cause the blade to contact the casing, resulting in the failure of the blade. Creep is usually of concern to engineers a... | Creep (deformation) | [
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c_ad0i48efsjl5 | In materials science, a refractory (or refractory material) is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Refractories are polycrystalline, polyphase, inorganic, non-metallic, porous, and heterogeneous. They are typically comp... | Refractory lining | [
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c_wqrogawhvaqf | In materials science, lamellar structures or microstructures are composed of fine, alternating layers of different materials in the form of lamellae. They are often observed in cases where a phase transition front moves quickly, leaving behind two solid products, as in rapid cooling of eutectic (such as solder) or eute... | Lamellar structure | [
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c_1eypuuoslx94 | A deeper eutectic or more rapid cooling will result in finer lamellae; as the size of an individual lamellum approaches zero, the system will instead retain its high-temperature structure. Two common cases of this include cooling a liquid to form an amorphous solid, and cooling eutectoid austenite to form martensite. I... | Lamellar structure | [
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c_32vl16h6thvx | In materials science, a Lomer–Cottrell junction is a particular configuration of dislocations. When two perfect dislocations encounter along a slip plane, each perfect dislocation can split into two Shockley partial dislocations: a leading dislocation and a trailing dislocation. When the two leading Shockley partials c... | Lomer–Cottrell junction | [
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c_hml0jk4v2moy | It is sessile and immobile in the slip plane, acting as a barrier against other dislocations in the plane. The trailing dislocations pile up behind the Lomer–Cottrell dislocation, and an ever greater force is required to push additional dislocations into the pile-up. ex. FCC lattice along {111} slip planes |leading| |t... | Lomer–Cottrell junction | [
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c_atr27i44owh5 | In materials science, MXenes are a class of two-dimensional inorganic compounds , that consist of atomically thin layers of transition metal carbides, nitrides, or carbonitrides. MXenes accept a variety of hydrophilic terminations. MXenes were first reported in 2012. | MXenes | [
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c_tn7tya2blsct | The CRSS is the value of resolved shear stress at which yielding of the grain occurs, marking the onset of plastic deformation. CRSS, therefore, is a material property and is not dependent on the applied load or grain orientation. The CRSS is related to the observed yield strength of the material by the maximum value o... | Critical resolved shear stress | [
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0.692944109439849... |
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