Effects of aging and co addition on martensitic and magnetic transitions in Ni-Al-Fe β-based shape memory alloys

Katsunari Oikawa, Yuuki Tanaka, Yuji Sutou, Toshihiro Omori, Luo Fenghua, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Effects of low temperature aging and the addition of Co on the martensitic and magnetic transitions in the Ni-Al-Fe β (B2-type structure) alloy system were investigated using differential scanning calorimetry, transmission electron microscopy and vibrating sample magnetometry. The martensitic transition temperatures of a Ni57Al25Fe18 specimen homogenized at 1 473 K for 1 h were decreased by aging after homogenization, the maximum decrease by aging being observed at 573 K. On the other hand, the substitution of Co or Fe for Ni induced a decrease of the martensitic transition temperatures and an increase of the Curie temperature, while the substitution of Co for Fe resulted in an increase of the martensitic transition and Curie temperatures. Co was thus shown to be an effective element by which both the martensitic and magnetic transition temperatures can be controlled.

Original languageEnglish
Pages (from-to)1287-1291
Number of pages5
JournalIsij International
Volume46
Issue number9
DOIs
Publication statusPublished - 2006

Keywords

  • Aging effect
  • Curie temperature
  • Martensite
  • Phase transformation
  • Shape memory

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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