Room temperature superelasticity in a lightweight shape memory Mg alloy

K. Yamagishi, Y. Ogawa, D. Ando, Y. Sutou, J. Koike

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalScripta Materialia
Volume168
DOIs
Publication statusPublished - 2019 Jul 15

Keywords

  • Grain size
  • Magnesium alloy
  • Martensitic transformation
  • Shape memory alloy
  • Superelastic alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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