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MARTENSITE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2006-07-10

English

Subject field(s)
  • Physics of Solids
DEF

The low-temperature, low-symmetry (tetragonal) crystal microstructure of shape-memory alloys produced by the martensitic transformation of austenite.

CONT

... there are three tetragonal variants of martensite for the cubic-to-tetragonal transformation ... the coexistence of several martensitic phases is at the basis of the intriguing shape-memory effect which occurs for example in nitinol: a deformation can be reversed upon heating.

OBS

austenite: The high-temperature, high-symmetry (cubic) crystal microstructure of shape-memory alloys.

OBS

martensitic transformation: A diffusionless solid-to-solid phase transition characterized by a rapid change of crystal structure, observed in metals, alloys, ceramics, and proteins.

French

Domaine(s)
  • Physique des solides
DEF

Structure cristallographique tétragonale, stable à basse température, qui résulte de la transformation martensitique de l'austénite lors d'un refroidissement.

OBS

transformation martensitique : Il s'agit d'une transformation de phase solide/solide, réversible et sans diffusion. En d'autres mots, les molécules changent de forme en fonction de la température en demeurant à leur position respective.

OBS

austénite : Structure cristallographique cubique des alliages à mémoire de forme, stable à haute température, qui résulte du chauffage de la martensite.

Spanish

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Record 2 1975-03-11

English

Subject field(s)
  • Metal Quenching
DEF

an unstable constituent in quenched steel, formed without diffusion and only during cooling below a certain temperature

French

Domaine(s)
  • Trempe (Métal)
CONT

le refroidissement brutal, par trempe, de l'austénite, donne naissance à un constituant hors d'équilibre, la martensite.

Spanish

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