Abstract:
For the first time, in the Fe–16Mn–10Cr–8Ni–4Si (wt.%) alloy single crystals with a reversible FCC $\leftrightarrow$ HCP martensitic transformation (MT), oriented for tension along the $[\bar111]$ direction, a shape memory effect (SME) of 10% was obtained with a successive increase in strain in the “load-unloading” cycle and heating in a free state. The magnitude of the SME turned out to be close to the theoretical value of the transformation strain $\varepsilon_{tr}$ = 10.8% for FCC-HCP MT in this orientation under tension. The physical reason for achieving the SME close to the theoretical value of $\varepsilon_{tr}$ is associated with a high level of stresses at the yield point $\sigma_{0.1}$ of the initial FCC phase, which leads to the development of FCC $\leftrightarrow$ HCP MT under stress without defect formation.
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