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, T c , equilibrium temperature, T o 5 (Ms + Af)/2, martensitic transition starting temperature, M s , 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 T o and T c , respectively. The Ga substitution for Ni or Fe decreased both the T o and T c . The entropy change accompanying the reverse martensitic transition showed compositional dependence due to the magnetic contribution. The saturation magnetization I s of the Ni–Fe–Ga system showed a strong dependence on the magnetic valence Z M . The Is values of the Ni–Fe–Ga alloys annealed at 1023 K showed the same Z m dependence as other ferromagnetic shape memory alloy (FSMA) systems.
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This article is based on a presentation made in the symposium entitled "Phase Transformations in Magnetic Materials," which occurred during the TMS Annual Meeting, March 12-16, 2006, in San Antonio, Texas, under the auspices of the Joint TMS–MPMD and ASMI–MSCTS Phase Transformations Committee.
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Oikawa, K., Omori, T., Sutou, Y. et al. Phase Equilibria and Phase Transition of the Ni–Fe–Ga Ferromagnetic Shape Memory Alloy System. Metall Mater Trans A 38, 767–776 (2007). https://doi.org/10.1007/s11661-007-9095-8
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DOI: https://doi.org/10.1007/s11661-007-9095-8