A Novel Thermo-Mechanical Processing Route Exploiting Abnormal Grain Growth in Heusler-Type Co–Ni–Ga Shape Memory Alloys

Abstract Heusler-type Co–Ni–Ga shape memory alloys attracted significant scientific attention owing to excellent superelasticity in single-crystalline state. However, due pronounced anisotropy, polycrystalline suffers from transformation-induced constraints at grain boundaries and, thus, premature failure upon thermo-mechanical loading. The present study reports on a novel processing route. Hot rolling followed by solution-annealing promotes abnormal growth, eventually leading high-performance structures. procedure proposed offers great potential for direct microstructure design.