An investigation of the Ho-Ni phase diagram

The phase diagram of the Ho-Ni binary system was investigated by X-ray diffraction, differential thermal analysis, optical microscopy and electron probe microanalysis techniques. The existence of eight intermediate phases has been confirmed: Ho 3Ni, Ho 3Ni 2, HoNi, HoNi 2, HoNi 3, Ho 2Ni 7, HoNi 5 a...

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Bibliographic Details
Published in:Journal of alloys and compounds 1991-12, Vol.177 (1), p.101-106
Main Authors: Huaiying, Zhou, Xiangli, Ou, Xiaping, Zhong
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Metals. Metallurgy
Physics
Specific phase transitions
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Summary:The phase diagram of the Ho-Ni binary system was investigated by X-ray diffraction, differential thermal analysis, optical microscopy and electron probe microanalysis techniques. The existence of eight intermediate phases has been confirmed: Ho 3Ni, Ho 3Ni 2, HoNi, HoNi 2, HoNi 3, Ho 2Ni 7, HoNi 5 and Ho 2Ni 17. The homogeneity region of the HoNi 2 phase extends from 65.6 to 66.7 at.% Ni. The other phases are line compounds. No appreciable solid solubility of holmium in nickel or of nickel in holmium was observed. Ho 3Ni 2 exists in two structural modifications depending on the temperature. HoNi and HoNi 5 melt congruently at 1060 and 1370°C respectively. There are seven peritectic reactions and three eutectic reactions in this system.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(91)90060-9