Phase equilibria and phase transformation of Co-Ni-Ga ferromagnetic shape memory alloy system

Katsunari Oikawa, Takuya Ota, Yousuke Imano, Toshiro Omori, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Phase equilibria and martensitic and magnetic phase transformations of theβ phase in the Co-Ni-Ga system have been investigated. It has been shown that the β phase is in equilibrium with the α-phase over a wide range compositions at 600-1100°C. The β phase exhibits both a paramagnetic-ferromagnetic transition and a thermoelastic martensitic transition from B2 to L10 structure. The Curie temperature T C increases with decreases in both Ni and Ga content, and the martensitic transition starting temperature Ms decreases with decreasing Ni content and with increasing Ga content. The composition region of the β phase exhibiting the thermoelatstic martensitic transformation from ferromagnetic austenite is located near the a + β two-phase region. T C and s of α + β two-phase alloys increase with increasing annealing temperature.

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalJournal of Phase Equilibria and Diffusion
Volume27
Issue number1
DOIs
Publication statusPublished - 2006 Feb
Externally publishedYes

Keywords

  • Annealing
  • Ferromagnetic
  • Magnetism
  • Martensite
  • Shape memory

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Phase equilibria and phase transformation of Co-Ni-Ga ferromagnetic shape memory alloy system'. Together they form a unique fingerprint.

Cite this