Abstract
The solid-state phase equilibria in the Fe–Ho–Pt ternary system at 1173 K (Ho ≤75%) were investigated by x-ray diffraction, scanning electron microscopy, and energy-dispersive x-ray spectroscopy techniques. The 1173 K isothermal section consists of 18 single-phase regions, 33 two-phase regions, and 16 three-phase regions. At 1173 K, we observed that the maximum solid solubility of Pt in Fe17Ho2, Fe23Ho6, Fe3Ho, and Fe2Ho is below 1 at.%. The binary phase Fe5Ho was not observed. The maximum solubility of Ho in α-Fe is about 1 at.%, and it is below 1.5 at.% in γ-(Fe, Pt), FePt, FePt3, and (Pt, Fe) (the solid solution of Fe in Pt). The existence of HoPt5, HoPt3, HoPt2, Ho3Pt4, HoPt, Ho5Pt4, Ho5Pt3, Ho2Pt, and Ho3Pt is confirmed, and the maximum solid solubility of Fe in them is below 1 at.%.
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This work was financially supported by the National Basic Research Program of China (2014CB643703) and the National Natural Science Foundation of China (authorized numbers: 50261002 and 51161005).
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Gao, X.Q., Gu, Z.F., Cheng, G. et al. Phase Equilibria in the Fe–Ho–Pt Ternary System at 1173 K. J. Phase Equilib. Diffus. 36, 485–492 (2015). https://doi.org/10.1007/s11669-015-0402-6
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DOI: https://doi.org/10.1007/s11669-015-0402-6