Negative Poisson's ratio in Heusler-type Cu–Al–Mn shape memory alloy

Sheng Xu, Ryota Tsukuda, Mi Zhao, Xiao Xu, Toshihiro Omori, Kyosuke Yoshimi, Ryosuke Kainuma

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A negative Poisson's ratio refers to the phenomenon of a material expanding along the transverse direction upon uniaxial tension. Here, we show a negative Poisson's ratio observed directly by experiments in a single-crystal Heusler-type Cu–16.9Al–11.6Mn (at%) shape memory alloy, in addition to the alloy's superelasticity. When stretched along the vicinity of the [110] direction, the alloy expands along the [11¯0] direction, showing a significant negative Poisson's ratio of −0.51, while shrinking along the [001] direction with a large positive Poisson's ratio of 1.36. These experimental results agree well with the values calculated from the elastic constants and elastic anisotropy.

Original languageEnglish
Pages (from-to)74-78
Number of pages5
JournalScripta Materialia
Volume177
DOIs
Publication statusPublished - 2020 Mar 1

Keywords

  • Negative Poisson's ratio
  • Shape memory alloy
  • Single crystal

ASJC Scopus subject areas

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

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