transformation austénite-martensite

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• Martensite —  Ne pas confondre avec la martinsite synonyme de halite Cet article est lié aux composés d …   Wikipédia en Français

• Austenite — (or gamma phase iron) is a metallic non magnetic solid solution of iron and an alloying element. In plain carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (about 727 °C); other alloys of steel have different… …   Wikipedia

• Martensite — For the transformation, see Diffusionless transformations. Iron alloy phases Ferrite (α iron, δ iron) A …   Wikipedia

• martensite — a metastable iron phase supersaturated in carbon that is the product of a diffusionless (athermal) transformation from austenite. Very rapid cooling (quenching) of steel (at about 1,000(C per minute) produces a new microstructure, martensite. It… …   Mechanics glossary

• martensite — martensitic /mahr tn zit ik/, adj. /mahr tn zuyt /, n. Metall. a metastable microconstituent of any of various forms of carbon steel, produced by undercooling sufficiently below the normal transformation temperature, esp. a hard, brittle product… …   Universalium

• Diffusionless transformation — Diffusionless transformations classifications A diffusionless transformation is a phase change that occurs without the long range diffusion of atoms but rather by some form of cooperative, homogeneous movement of many atoms that results in a… …   Wikipedia

• Nickel titanium — Nickel titanium, also known as nitinol, is a metal alloy of nickel and titanium, where the two elements are present in roughly equal atomic percentages. Nitinol alloys exhibit two closely related and unique properties: shape memory and… …   Wikipedia

• Shape-memory alloy — A shape memory alloy (SMA, smart metal, memory metal, memory alloy, muscle wire, smart alloy) is an alloy that remembers its original, cold forged shape: returning the pre deformed shape by heating. This material is a lightweight, solid state… …   Wikipedia

• Shape memory alloy — A shape memory alloy (SMA, also known as a smart alloy, memory metal, or muscle wire) is an alloy that remembers its shape, and can be returned to that shape after being deformed, by applying heat to the alloy. When the shape memory effect is… …   Wikipedia

• Martensit — ist ein hartes, ferromagnetisches und metastabiles Gefüge in Metallen, das diffusionslos und athermisch durch eine kooperative Scherbewegung aus dem Ausgangsgefüge entsteht. Dabei muss das Material von der Temperatur einer Hochtemperaturphase… …   Deutsch Wikipedia

• MÉTALLOGRAPHIE - Essais physiques — Les principales caractéristiques physiques, en tout cas celles d’usage le plus courant, concernent respectivement la dilatation, la résistivité électrique, la capacité thermique massique, la conductivité thermique, les propriétés magnétiques, le… …   Encyclopédie Universelle