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Damping via Cu-Zn-Al shape memory alloys (SMA): the action of diffusive effects on the macroscopic description

The thermoelastic martensitic transformation is the origin of the peculiar properties of Cu-based SMA. One of the potential uses consists on taking advantage of their hysteresis cycle to smooth the oscillations induced by wind or quakes. 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 their response to the external thermodynamic forces. The evolution associated to diffusion effects (phase coexistence and temperature-time on parent phase) is also included. 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 the scarce events (as in earthquakes). Using a simple case, the simulation determines the boundaries of the suitable fluctuation zone related to the diffusive effects (summer, winter and coexistence effects). The results establish a way to guarantee the damper behavior for several years.