Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

Hengxing Jiang, Xiao Xu, Toshihiro Omori, Makoto Nagasako, Jingjing Ruan, Shuiyuan Yang, Cuiping Wang, Xingjun Liu, Ryosuke Kainuma

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Martensitic transformation in off-stoichiometric Co2VSi Heusler alloy was firstly confirmed in this work. The martensite phase presents an ordered 2M non-modulate D022 structure transformed from L21 Heusler structure. In the Co63.5V17.0Si19.5 alloy, the forward and reverse martensitic transformation temperatures are extremely high which reach up to 683 °C and 693 °C, respectively, higher than most known Heusler-type high-temperature shape memory alloys. And results also indicate that the single martensite phase alloy exhibits a good ductility and strength with the compressive strain of over 15% and strength of about 2300 MPa, respectively. What's more, the recoverable strain being maximal to around 3.1% can be obtained at high temperature (750–800 °C) due to its reverse martensitic transformation.

Original languageEnglish
Pages (from-to)191-196
Number of pages6
JournalMaterials Science and Engineering A
Volume676
DOIs
Publication statusPublished - 2016 Oct 31

Keywords

  • Co-V-Si Heusler alloy
  • Martensitic transformations
  • Mechanical property
  • Shape memory effect

ASJC Scopus subject areas

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

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