Matériaux à mémoire de forme

We give a macroscopic model of martensite-austenite phase change in metallic alloys. This model describes the shape memory phenomenon as well as the strong influence of the temperature on the mechanical constitutive laws. The model assumes that the phases coexist in various volumetric proportions and that the free energy of each of the phases has a simple and classical expression On donne un modele macroscopique du changement de phase martensite-austenite dans les alliages metalliques. Il decrit le phenomene de memoire de forme ainsi que la forte influence de la temperature sur les lois de comportement mecanique. Le modele suppose que les phases coexistent en diverses proportions volumiques et que l'energie libre de chacune d'elles a une expression simple et classique