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.
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