MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Re-examination of Phase Diagram of Fe-Pt System
Yoshitaro NoséAyako KushidaTeruyuki IkedaHideo NakajimaKatsushi TanakaHiroshi Numakura
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2003 Volume 44 Issue 12 Pages 2723-2731

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Abstract

The phase boundaries pertaining to γ2 (FePt) and γ3 (FePt3) phases in the Fe-Pt system have been re-examined by measuring (1) the compositions of interphase boundaries in diffusion couples, (2) the equilibrium compositions in two-phase alloys and (3) the electrical resistivity as a function of temperature. The results obtained by the three methods are consistent with each other. The γ (fcc solid solution) ↔ γ23 eutectoid has been found to be located at a point higher in Pt concentration and lower in temperature than in the currently adopted phase diagram, the stability range of the γ2 phase exhibits considerable asymmetry. Other phase boundaries, as well as the ferromagnetic ↔ paramagnetic transition in the γ2 phase detected by the resistivity measurements, are in fair agreement with the data in the literature.

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© 2003 The Japan Institute of Metals and Materials
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