Stress–temperature phase diagram of a ferromagnetic Ni–Mn–Ga shape memory alloy

A sequence of thermally and stress-induced intermartensitic transformations has been found in a Ni 52.0Mn 24.4Ga 23.6 single crystal, which have been confirmed by transmission electron microscopy through in situ cooling experiments. The stress–strain–temperature behavior under compression along the 〈1 1 0〉 P and 〈1 0 0〉 P crystallographic directions has also been studied for this compound and a stress–temperature phase diagram has been established.