Peculiarities of high-temperature superelasticity in Ni–Fe–Ga single crystals in compression

The high-temperature superelasticity and temperature dependence of the yield stress of 14$M$ and $L$1$_{0}$ martensite in [001]-oriented single crystals of Ni$_{54}$Fe$_{19}$Ga$_{27}$ (at %) in compression alloy have been studied. As the temperature increases, the sequence of stress-induced martensitic transformations (MTs) changes from $L$2$_{1}$–14$M$ to $L$2$_{1}$–$L$1$_{0}$. The yield stress of $L$1$_{0}$ martensite weakly depends on the temperature and is 1.7 times lower than that of 14$M$ martensite. The temperature interval of superelasticity in [001]-oriented single crystals of Ni$_{54}$Fe$_{19}$Ga$_{27}$ under compression is determined by the growth of critical stresses with increasing temperature, the coefficient of strain-hardening, and the yield stress of $L$1$_{0}$ martensite.