The shape-memory effect and superelasticity in single-crystal ferromagnetic alloy FeNiCoAlTi

The reversible thermoelastic $\gamma$–$\alpha'$ martensitic transformations under load in new single-crystal ferromagnetic Fe–28%Ni–17%Co–11.5%Al-2.5%Ti (at%) alloy have been studied. It is shown for the first time that precipitation of dispersed particles of the $\gamma'$ phase during aging for 7 h at 973 K induces the shape-memory effect and superelasticity in [001] single crystals of Fe–Ni–Co–Al–Ti alloy upon tensile strain. Superelasticity $\varepsilon_{SE}$ = 4.5–6% manifests itself in the temperature range $T$ = 183–333 K.