Abstract
Interdiffusion coefficients of the refractory elements in Ni–X–Y (X, Y ¼ 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 ~ D Ni is much smaller by an order of magnitude than the main interdiffusion coefficient ~ D Ni in Ni–Ru–Re system. This result indicates that the thermodynamical interaction parameter (Wagner’s interaction
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