Phase transformation and magnetic properties of Ni–Mn–Ga–Ti ferromagnetic shape memory alloys

The influence of partial substitution of Ti for Ga on martensitic transformation temperatures, Curie temperature and magnetization saturation of Ni53Mn23.5Ga23.5 ferromagnetic shape memory alloys were investigated in detail. The results show that solubility limits of Ti in the matrix is found to be about 8 at.%. The martensitic transformation temperatures were increased markedly in samples with 0.5–8 at.% titanium, and decreased with more than 8 at.% titanium addition. While the Curie temperature almost remains unchanged at low-Ti content and subsequently decreases obviously. Magnetization saturation of martensitic phase decrease with the increasing titanium content since it is sensitive to ordered atomic arrangement.