Superelastic behavior of Fe-Mn-Si-Cr shape memory alloy coil

Abstract

In this study the superelastic effect of Fe-Mn-Si-Cr shape memory alloys was investigated using a coil which permits the measurement of small strain. Fe-Mn-Si shape memory alloys were found to exhibit superelastic behavior to some extent over a temperature range above As. Superelastic behavior was most pronounced in the temperature range near 100°C. The strain which was superelastically recovered at 100°C is 0.22% when 0.37% strain was introduced; 0.15% strain remained in the coil. When deformation was repeated at 80°C, the superelastic recovery became more conspicuous. This is because repetitive deformation suppresses slip deformation. This effect is similar to the so-called training for improving the shape memory effect of Fe-Mn-Si alloys. ©2000 The Japan Institute of Metals.