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.
@article{doi:10.17170/kobra-202212147222,
author ={Lauhoff, Christian and Pham, Thomas and Paulsen, Alexander and Krooß, Philipp and Frenzel, Jan and Eggeler, Gunter and Niendorf, Thomas},
title ={A Novel Thermo-Mechanical Processing Route Exploiting Abnormal Grain Growth in Heusler-Type Co–Ni–Ga Shape Memory Alloys},
keywords ={660 and Memory-Legierung and Heuslersche Legierung and Cobaltlegierung and Nickellegierung and Galliumlegierung and Kornwachstum and Thermomechanische Belastung},
copyright ={http://creativecommons.org/licenses/by/4.0/},
language ={en},
journal ={Metallurgical and Materials Transactions A},
year ={2022-10-04}
}