Reorientation in Combined Stress Induced Martensite?

¹ Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, 180 40, Czech Republic
² Faculty of Engineering, Mie University, Kamihama-cho 1515, Tsu, Mie 514, Japan

Abstract

The thermoelastic martensitic transformation induced by independent external forces has been investigated in combined tension-torsion experiments with Cu-Al-Zn-Mn SMA hollow bar polycrystals. When the nonproportional change of the applied stress (reloading) occurs at low volume fraction of stress induced martensite phase, the shape of the experimental transformation path suggests, that the forward or reverse stress induced martensitic transformations take place, depending whether the mechanical energy is being supplied or released. At higher volume fraction of martensite, the deformation behavior upon reloading becomes more complex, suggesting a possible role of martensite to martensite transformations or reorientation processes.