Phase equilibria and phase transition of the Ni-Fe-Ga ferromagnetic shape memory alloy system

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Abstract

Phase equilibria and martensitic and magnetic transitions of the β (B2 and L21) phase in the Ni-Fe-Ga system were investigated. The b phase was found to be in equilibrium with the γ (A1 structure) or γ′ (L12 structure) phase. The Curie temperature, Tc, equilibrium temperature, To = (Ms + Af)/2, martensitic transition starting temperature, Ms, and reverse transition finishing temperature, Af, of the β single-phase alloys were sensitive to the Fe and Ga compositions. The Fe substitution for Ni decreased and increased the To and Tc, respectively. The Ga substitution for Ni or Fe decreased both the To and Tc. The entropy change accompanying the reverse martensitic transition showed compositional dependence due to the magnetic contribution. The saturation magnetization Is of the Ni-Fe-Ga system showed a strong dependence on the magnetic valence ZM. The Is values of the Ni-Fe-Ga alloys annealed at 1023 K showed the same Zm dependence as other ferromagnetic shape memory alloy (FSMA) systems.

Original languageEnglish
Pages (from-to)767-776
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume38
Issue number4
DOIs
Publication statusPublished - 2007 Apr

ASJC Scopus subject areas

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

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