J. Phys. IV France 01 (1991) C4-379-C4-384
PROBLEMS ASSOCIATED TO NUCLEATION AND GROWTH IN THE Cu-Zn-Al SMAA. AMENGUAL1, F.C. LOVEY2 and V. TORRA3
1 Departament de Fisica, Universitat de les Illes Balears, SP-07071 Palma de Mallorca, Spain
2 Division Metales, Centro Atomico de Bariloche, RA-8400 San Carlos de Bariloche, Argentina
3 Dep. Fisica Aplicada, ETSECCP - UPC, SP-08034 Barcelona, Spain
We have studied the characteristics of single-interface single-variant martensitic transformations in Cu-Zn-Al shape memory alloys with a high resolution thermal device (temperature resolution 0.003 K, optical resolution up to 1 µm) Two observations are presented : the appearence of an intrinsic thermoelasticity and the possibility to get two β-variants from a martensite single-crystal. The first phenomena is a phase growth problem (the interaction between interface and dislocations), whilst the second depends on the nucleation of the β phase and permits the breakdown of the SME.
© EDP Sciences 1991