Abstract
AbstractHeusler-type Co–Ni–Ga shape memory alloys attracted significant attention due to their excellent functional properties in single-crystalline state under both compressive and tensile loading. The present study investigates the superelastic deformation behavior under torsion. Using a newly installed torsion testing setup, in situ synchrotron diffraction was carried out on single-crystalline material in order to investigate the martensitic phase transformation. Incremental deformation experiments reveal a fully reversible martensitic transformation under torsional loading at room temperature, leading to excellent strain recovery after deformation to 6.5% shear strain. Furthermore, relevant aspects towards the analysis of powder diffraction data obtained for single-crystalline material in transmission mode under torsional loading are presented and critically discussed.
Publisher
Springer Science and Business Media LLC
Reference44 articles.
1. Otsuka K (1999) Shape memory materials, 1. Paperback ed. (with corr.). Cambridge University Press, Cambridge
2. Lagoudas DC (2008) Shape memory alloys: modeling and engineering applications. Springer, New York
3. Duerig TW, Melton KN, Stöckel D, Wayman CM (1990) Engineering aspects of shape memory alloys. Elsevier, Kent
4. Reul A, Lauhoff C, Krooß P, Gutmann MJ, Kadletz PM, Chumlyakov YI, Niendorf T, Schmahl, WW (2018) In situ neutron diffraction analyzing stress-induced phase transformation and martensite elasticity in [001]-oriented Co49Ni21Ga30 shape memory alloy single crystals. Shap Mem Superelasticity 4:61–69
5. Krooß P, Kadletz PM, Somsen C, Gutmann MJ, Chumlyakov YI, Schmahl WW, Maier HJ, Niendorf T (2016) Cyclic degradation of Co49Ni21Ga30 high-temperature shape memory alloy: on the roles of dislocation activity and chemical order. Shap Mem Superelasticity 2:37–49