Superelasticity and its stability of an ultrafine-grained Ti49.2Ni50.8 shape memory alloy processed by equal channel angular pressing

Superelasticity and cycling stability of an ECAP-processed Ti49.2Ni50.8 alloy were investigated as a function of annealing temperature. After annealing at 400 °C for 30 min, Ti3Ni4 precipitates formed to strengthen the matrix and yet the grain size kept constant. Such an annealing favors to optimize the superelasticity.