The effect of aging on the Ni–Mn–Ga high-temperature shape memory alloys

Martensite aging results in martensite stabilization in single-phase Ni54Mn25Ga21 alloy; however, it has no effect on the transformation temperatures of dual-phase Ni58Mn25Ga17 alloy. The reverse martensitic transformation temperatures of both alloys decrease sharply with the increase of aging time and then graduate to a constant level after austenite aging.