An Experimental Study on Rate-sensitive Tensile Deformation Behaviour of Fe-based Shape Memory Alloy

¹ Institute of Engineering, Hiroshima University, 1–4–1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739–8527 Japan
² Graduate School of Engineering, Hiroshima University, 1–4–1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739–8527 Japan

^a Corresponding author: iwamoto@mec.hiroshima-u.ac.jp

Abstract

Recently, it is attempted to apply high manganese steel including Fe-based shape memory alloy to vibration dampers. Especially, the alloy indicates a special characteristic as a well-known shape memory effect. By coupling between this effect and its plastic deformation, it can be considered that its deformation behaviour at higher deformation rate becomes quite complicated and still unclear. In this study, tensile tests of Fe-based shape memory alloy at different rate of deformation are conducted by using two different testing apparatuses such as the conventional material testing machine and impact testing machine based on the split Hopkinson pressure bar technique. In the tests, temperature rise is captured during the quasi-static deformation. After the quasi-static test, the recovery strain due to shape memory effect is measured by heating up the deformed specimens to A_f temperature. Finally, the rate sensitivity of the alloy is discussed including the recovery strain.