Ferromagnetic Co-Ni-Al Shape Memory Alloys with β+γ Two-Phase Structure

Yuuki Tanaka, Toshihiro Ohmori, Katsunari Oikawa, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

The effects of the introduction of the γ (A1) phase into the β(B2) phase on the mechanical and shape memory properties in ferromagnetic Co-Ni-Al shape memory alloys with the β+ γ two-phase structure were investigated by cold-rolling, tensile tests, and bending tests. The mechanical properties were found to be improved with an increase in the volume fraction of the γ phase, and Co-33 at%Ni-26 at%Al alloy with Vγ = 36% exhibited excellent cold workability with a critical reduction ratio of 40%. Although the degree of shape recovery decreases with an increase in the volume fraction of the γ phase, it can be enhanced by training. Since two-phase β+ γ Co-Ni-Al alloys have several advantages such as cost efficiency and workability, this alloy system is considered as being a new type of ferromagnetic shape memory alloys (FSMAs).

Original languageEnglish
Pages (from-to)427-430
Number of pages4
JournalMaterials Transactions
Volume45
Issue number2
DOIs
Publication statusPublished - 2004 Feb

Keywords

  • Ferromagnetic shape memory alloys

ASJC Scopus subject areas

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

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