Effect of aging on magnetic properties and phase transition of Ni53Mn23.5Ga23Ti0.5 ferromagnetic shape memory alloy

The effects of aging on magnetic properties and phase transformation were investigated for Ni53Mn23.5Ga23Ti0.5 shape memory alloy. The results show that the amount and size of Ni3Ti particles firstly increase and then amount of second phase decreases with the increasing aging temperature. Moreover, the transformation temperatures gradually decrease; Curie temperatures slightly decrease first and reach their minimum values at 973 K then increase with the increasing aging temperature. The saturation magnetizations firstly remain almost unchanged and then slightly decrease when aging temperature is above 973 K.