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In this study, the shape recovery and mechanical properties of Ni 54 Mn 16 Fe 9 Ga 21  high-temperature shape memory alloy are improved simultaneously. This results from the low, about 4.4%, volume fraction of γ phase being almost completely distributed along grain boundaries. The recovery strain gradually increases with the increase in residual strain with a shape recovery rate of above 68%, up to a maximum value of 5.3%. The compressive fracture strain of Ni 54 Mn 16 Fe 9 Ga 21  alloy is about 35%. The results further reveal that when applying a high compression deformation two types of cracks form and propagate either within martensite grains (type I) or along the boundaries between martensite phase and γ phase (type II) in the present two-phase alloy.

Improved polycrystalline Ni 54 Mn 16 Fe 9 Ga 21 high-temperature shape memory alloy by γ phase distributing along grain boundaries