Overview
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Gérard GUÉNIN: INSA engineer (National Institute of Applied Sciences) - Doctor of Science - Professor at INSA Lyon
INTRODUCTION
Typically, when a metal or alloy is subjected to mechanical stress in excess of its yield strength, it undergoes plastic deformation which remains after the stress has ceased. This deformation then evolves little or not at all during subsequent heat treatments. Memory alloys seem to escape this behavior, familiar to metallurgists and mechanics alike: a sample of such an alloy, apparently plastically deformed at a given temperature, can recover its initial shape in its entirety simply by heating. This deformation can reach 8% in tension. This phenomenon is known as shape memory, and is associated with a reversible martensitic-type structural transformation that takes place between the temperature at which the sample was deformed and that at which it was reheated to regain its shape. This martensitic transformation is also responsible for other unusual thermoelastic properties, such as superelasticity. Describing these properties requires a basic understanding of martensitic transformations.
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Studies and properties of metals
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Shape memory alloys
References
Books and magazines
Theses
- - http://www.sudoc.abes.fr
- DALLE (F.) - Étude de l'alliage à mémoire de forme Nickel-Titane-Hafnium à hautes températures de transformation : élaboration conventionnelle et non conventionnelle, mise en forme, caractérisation et évaluation....
Standardization
Association Française de Normalisation AFNOR
- Alliages à mémoire de forme. Vocabulaire et mesures. - NF A 51-080 - 4-1991
Suppliers (non-exhaustive list)
Copper-based alloys: Trefimetals: http://www.trefimetaux.com
Titanium-nickel alloys: Mémométal Technologies: http://www.memometal.com
Iron-based alloys: Ugitech: http://www.uginesavoie.fr
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