Stress-induced FCC-HCP martensitic transformation of rapid-solidified Co-Ni Foil

Takasi Ueno, Takesi Kubota, Teiko Okazaki, Yasubumi Furuya

Research output: Contribution to journalArticlepeer-review

Abstract

Ferromagnetic Co-Ni alloys of less than 35 at%Ni exhibit a phase transformation from γ-phase (FCC) to ε phase (HCP): both phases are stable at higher and lower temperatures, respectively. Since both phases of these alloys exhibit high magnetization and thermoelastic martensitic transformation, it is expected as new ferromagnetic shape memory alloy. In this study, We prepared a rapid-solidified Co-32 at%Ni foil and analyzed thermoelastic and stress-induced martensite phase in temperature range of 77 to 673 K from observation of the texture, structure, magnetic property and Barkhausen noise. From these results, it is found that 1) the thermoelastic martensitic transformation is not reversible and 2) a stress-induced martensite phase is transformed to a austenite phase by heating. The result is caused by the mechanism of the transformation from a γ-phase (HCP) to ε-phase (FCC).

Original languageEnglish
Pages (from-to)643-648
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume69
Issue number8
DOIs
Publication statusPublished - 2005 Aug

Keywords

  • Cobalt-nickel alloy
  • Face centered cubic⇔hexagonal closed-packed transformation
  • Martensite phase
  • Rapid-solidified foil

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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