ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
The γ Solvus Surface in Ni-Al-X (X: Cr, Mo, and W) Ternary Systems
Yong Myong HongHitoshi NakajimaYoshinao MishimaTomoo Suzuki
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1989 Volume 29 Issue 1 Pages 78-84

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Abstract

An investigation on the γ/γ' phase equilibria with particular emphasis or γ solvus is carried out in ternary Ni-Al-X systems with X being one of the VIA transition metal elements, Cr, Mo, or W. Differential thermal analysis (DTA) is employed as a key experimental technique, which is not very common to be used for the determination of phase boundaries. It is superior to the conventional methods because γ solvus surface with respect to ternary composition and temperature is readily obtained. The results obtained in each ternary system seem to be consistent and accurate, by which a large discrepancy is in many cases pointed out upon comparisons with the information reported in the past. An advanced analytical method, SEM-EDX, not only confirms the results obtained on γ solvus but also provides solid evidences for the occurrence of a four phase equilibrium in Ni-Al-Cr and in Ni-Al-Mo systems which is suggested by the results of DTA.

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© The Iron and Steel Institute of Japan
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