The γ Solvus Surface in Ni-Al-X (X: Cr, Mo, and W) Ternary Systems

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概要

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• 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.

著者

• SUZUKI Tomoo

  Research & Development Institute, MIKI Corporation

• Mishima Yoshinao

  Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology

• Hong Yong

  Graduate School, Tokyo Institute of Technology

• Nakajima Hitoshi

  Graduate School, Tokyo Institute of Technology

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