Effect of Gd addition on microstructure, martensitic transformation and mechanical properties of Ni₅₀Mn₃₆Sn₁₄ferromagnetic shape memory alloy

The effect of Gd addition on microstructure, martensitic transformation and mechanical properties of Ni₅₀Mn₃₆Sn₁₄ferromagnetic shape memory alloy has been investigated. The results show that Gd addition leads to some changes in the microstructure and crystal structure. Martensitic transformation is observed in Ni₅₀Mn₃₆Sn₁₄alloys with adding different amount of Gd. The compressive strength and compressive strain of alloys is notably enhanced with the increase in Gd content. The compressive strength increases from 448 MPa to 707 MPa and the compressive strain increases from 4.5% to 9.0% with increasing Gd content from 0 at.% to 2 at.%. The mechanism of the improved mechanical properties is also revealed.