High-temperature superelasticity and competing microstructural mechanisms in Co49Ni21Ga30 shape memory alloy single crystals under tension

J. A. Monroe, I. Karaman, H. E. Karaca, Y. I. Chumlyakov, H. J. Maier

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

A large temperature range of stress-induced martensitic transformation with >8% superelastic strain is demonstrated in [1 0 0]-oriented Co49Ni21Ga30 single crystals. The nature of the superelastic response is greatly affected by temperature and test history due to the temperature-dependent dominant microstructural mechanisms. We provide an insight into these mechanisms and divide the response into three temperature stages. Interestingly, a small stress hysteresis of only 2 MPa was achieved after the superelastic experiments at 300 °C compared to 20 MPa of the virgin sample.

Original languageEnglish
Pages (from-to)368-371
Number of pages4
JournalScripta Materialia
Volume62
Issue number6
DOIs
StatePublished - Mar 2010

Keywords

  • High-temperature deformation
  • Martensitic phase transformation
  • Shape memory alloys
  • Superelasticity

ASJC Scopus subject areas

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

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