An investigation was made, of the interdiffusion behaviour in the β single-phase region of the Ni–Al–Cr system, by using the modified Boltzmann–Matano method. The interdiffusion coefficient matrix was estimated, and the cross-interdiffusion coefficients were found to be smaller than the main interdiffusion coefficients within the composition ranges examined. Combining the thermodynamic calculation of the isochemical potential lines revealed that the thermodynamic interaction between Al and Cr in Al-rich β-Ni(Al,Cr) was perhaps negligible.

Interdiffusion in the β Phase Region of the Ni-Al-Cr System. G.C.Hou, H.Wei, N.R.Zhao, X.F.Sun, H.R.Guan, Z.Q.Hu: Scripta Materialia, 2008, 58[1], 57-60