Mechanical and functional properties of two-phase Ni₅₃Mn ₂₂Co₆Ga₁₉ high-temperature shape memory alloy with the addition of Dy

The effects of Dy addition on microstructure, martensitic transformation, mechanical and shape memory properties of the two-phase Ni₅₃Mn ₂₂Co₆Ga₁₉ high-temperature shape memory alloy were investigated. It is found that a small Dy addition results in the refinement of grain size, which can effectively improve the tensile ductility and strength of the two-phase Ni₅₃Mn₂₂Co ₆Ga₁₉ alloy. However, a Dy(Ni,Mn)₄Ga precipitate forms in the alloys with the Dy addition, and its amount increases with an increase in the Dy addition. This change causes the ductility of the alloys to decrease when the Dy addition is further increased to 0.3 at.%. The results further show that the changes in the martensitic transformation temperature of the studied alloys can be attributed to the combined effects of the tetragonality (c/a) and electron concentration (e/a) of martensite. Additionally, the shape memory effects of the alloys are closely related to the refinement of grain size and the alloy strength. In this study, the (Ni ₅₃Mn₂₂Co₆Ga₁₉)_99.8Dy _0.2 alloy exhibits a variety of good properties, including a high martensitic transformation starting temperature of 385.7 °C, a tensile ductility of 10.3% and a shape memory effect of 2.8%.