J. Phys. IV France 112 (2003) 1155
Mesoscale observations and yearly effects in Cu-Zn-Al shape memory alloys: Representative model and predictable damping effectsV. Torra1, A. Isalgue1, F.C. Lovey2 and M. Sade2
1 CIRG-DFA-ETSECCPB-UPC, CIGran Capità sln, Campus Nord B-4, 08034 Barcelona, Catalonia, Spain
2 Centro Atomico Bariloche, Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina
The use of the damping effect produced by the hysteresis cycle is one of the relevant applications in shape memory alloys. The experimental study at mesoscale level of the Cu-based alloys and in preliminary level of TiNi allows the development of a one-dimensional model that describes the response to the external thermodynamic forces, including the evolution associated to diffusion effects (phase coexistence and temperature-time on parent phase). The results furnished by the model establish the appropriate guarantee of the alloy properties for series of working cycles separated by long times in austenite phase, as scarce events (as in earthquakes). Using a simple case, the damping effect is visualized with the fluctuations imposed by summer-winter actions. the coexistence effects among the phases and the seasonal room temperature actions on parent phase.
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