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Title: Hysteresis in Cu-Zn-Al SMA: From high resolution studies to the time dependent modelling and simulation
Authors: Pelegrina, J. L.
De Rivera, M. Rodriguez 
Torra, V.
Lovey, F. C.
UNESCO Clasification: 2213 Termodinámica
Issue Date: 1995
Publisher: 0956-7151
Journal: Acta Metallurgica et Materialia 
Abstract: The role of diffusional processes, time and temperature dependent, on the hysteretic behaviour was studied using a high resolution stress-strain-temperature specially developed apparatus. The evolution of the stress-strain curves with time was followed in partially transformed specimens, having several martensite plates, all of the same variant. Exponential type behaviour was observed, and four different time constants were obtained from experiments performed under particular conditions. A physical interpretation could be suggested for all of these parameters. They are related to the evolution of the Ms with the time elapsed from the thermal treatment, the martensite stabilization and the β-recovery. Some of these time constants were found to be dependent on the presence and movement of the β-martensite interfaces. A model based on the experimentally determined parameters was developed, which allows to simulate the observed time-dependent behaviour.
ISSN: 0956-7151
DOI: 10.1016/0956-7151(94)00305-2
Source: Acta Metallurgica et Materialia [ISSN 0956-7151], v. 43, p. 993-999
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