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A novel thermo-mechanical processing route exploiting abnormal grain growth in Heusler-type Co–Ni–Ga shape memory alloys

C. Lauhoff, T. Pham, A. Paulsen, P. Krooß, J. Frenzel, G. Eggeler, T. Niendorf

Metallurgical and Materials Transactions A, 53, 4139–4142, (2022)

DOI: 10.1007/s11661-022-06827-7

Download: BibTEX

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

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