MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Diffusion of Refractory Elements in Ni–X–Y (X, Y: Re, W, Ru, Al) Ternary Alloys
Masataka HattoriNobuhiro GotoYoshinori MurataToshiyuki KoyamaMasahiko Morinaga
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2006 Volume 47 Issue 2 Pages 331-334

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Abstract

Interdiffusion coefficients of the refractory elements in Ni–X–Y (X, Y=W, Re, Ru, Al) ternary systems, which are the fundamental systems of Ni-based superalloys, were estimated by a series of experiments using diffusion couples. The modified ternary Boltzmann–Matano method was employed for analyzing the experimental data. The cross interdiffusion coefficients were smaller than the main interdiffusion coefficients in all systems. Especially, the cross interdiffusion coefficient \\ ildeDReRuNi is much smaller by an order of magnitude than the main interdiffusion coefficient \\ ildeDReReNi in Ni–Ru–Re system. This result indicates that the thermodynamical interaction parameter (Wagner’s interaction parameter) between Ru and Re is negligible, and implies that Ru does not affect the distribution behaviour of Re into γ and γ′ phases.

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© 2006 The Japan Institute of Metals and Materials
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