J. Phys. IV France 01 (1991) C4-451-C4-456
SOME ASPECTS OF THE TWO WAY SHAPE MEMORY EFFECT INDUCED BY PSEUDOELASTIC CYCLING IN Cu-Zn-Al ALLOYSE. CESARI1, C. PICORNELL1, J. PONS1 and M. SADE2
1 Dept. Fisica, Universitat de les Illes Balears, Ctra. de Valldemossa, km. 7.5, SP-07071 Palma de Mallorca, Spain
2 Division Metales, Centro Atomico Bariloche, RA-8400 San Carlos de Bariloche, Argentina
The two-way shape memory effect (TWSME) induced by pseudoelastic cycling in Cu-Zn-Al single crystals has been studied. We analyzed the influence of the mechanical cycling characteristics (tensile or compressing) and of the presence of [MATH]-phase precipitates in the material. The two-way memory effect induced by compressing cycling appears after a smaller number of cycles than in tensile pseudoelastic cycling. The presence of [MATH]-phase precipitates also reduces the number of cycles needed to get the TWSME. Samples with TWSME are able to overcome some external stress when going to the martensitic shape until a threshold stress, [MATH], value is reached. When higher opposing stresses are applied, the degradation of TWSME starts.
© EDP Sciences 1991