Room temperature superelasticity in a lightweight shape memory Mg alloy. (15th July 2019)

• Record Type: Journal Article
• Authors: Yamagishi, K.; Ogawa, Y.; Ando, D.; Sutou, Y.; Koike, J.
• Is Part Of: Scripta materialia. Number 168(2019)
• Page Start: 114
• Page End: 118
• Publication Date: 2019-07-15
• Subjects: Magnesium alloy -- Shape memory alloy -- Superelastic alloy -- Martensitic transformation -- Grain size; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.04.023
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: To realize a superelastic Mg-Sc lightweight alloy at room temperature, we investigated the stress–strain behavior of Mg-18.7 at.% Sc alloy sheets at room temperature with martensitic transformation starting temperature of approximately −90 °C. We found that the superelasticity of the alloy strongly depends on the grain size and a distinct room temperature superelasticity (~3% superelastic strain) was obtained in the alloy with a large grain size. The obtained maximum superelastic strain was smaller than that expected from the orientation dependence of the transformation strain. This result suggests that the stress-induced martensite phase was stabilized because of the introduction of slip defects. Graphical abstract: Unlabelled Image