Pseudoelasticity in an Fe-28Mn-6Si-5Cr shape memory alloy

Pseudoelasticity (PE) is clearly seen in Fe-28Mn-6Si-5Cr shape memory alloy exhibiting non-thermoelastic martensitic transformation, especially in the sheets hot rolled with a low finishing temperature (FT). Comparison between the temperature dependence of PE and that of shape memory effect (SME) indicates that the gamma double left right arrow epsilon transformation is responsible not only for the SME but also for the PE. As a result of consideration including variations in 0.2% proof stress and 2.0% flow stress with temperature, it is concluded that PE depends on the amount of the deformation due to the gamma --> epsilon transformation, the external stress and some temperature-dependent effects which balance against the 'back stress' on unloading. Effects of temperature and low-FT hot rolling on PE are discussed on the bases of the above-mentioned factors. Published by Elsevier Science S.A.