Thermal, magnetic field- and stress-induced transformation in Heusler-type Co-Cr-Al-Si shape memory alloys

Takumi Odaira, Xiao Xu, Atsushi Miyake, Toshihiro Omori, Masashi Tokunaga, Ryosuke Kainuma

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The phase diagram, including the martensitic and magnetic transformations, was determined by thermoanalysis and thermomagnetization measurements in the CoxCr79-xAl10.5Si10.5 section of the Co-based Heusler shape memory alloy. Magnetization measurements under pulsed magnetic fields were conducted and magnetic field-induced reverse martensitic transformation was clearly observed at room temperature. A superelastic behavior was obtained in the Co55.7Cr23.3Al10.5Si10.5 alloy in the temperature range of 198 to 423 K. The critical stress for martensitic transformation was found to show a negative temperature dependence at temperatures lower than approximately 310 K due to the magnetic effect despite the normal temperature dependence at higher temperatures.

Original languageEnglish
Pages (from-to)35-39
Number of pages5
JournalScripta Materialia
Volume153
DOIs
Publication statusPublished - 2018 Aug

Keywords

  • Co-based Heusler alloy
  • Magnetic field-induced phase transition
  • Phase diagram
  • Shape memory alloy
  • Superelasticity

ASJC Scopus subject areas

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

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