2004 Volume 54 Issue 7 Pages 280-286
The interdiffusion experiments of Ti-rich β Ti–Al–Cr alloys have been performed in the temperature range from 1273 to 1473 K. The concentration profiles indicate that the diffusion distance of Cr is somewhat longer than that of Al in the solid solutions. The diffusion paths show S-shaped curves. The formation of S-shaped diffusion paths is attributed to the difference between the diffusion distance of Cr and Al. The direct and indirect interdiffusion coefficients are positive in the ternary alloys, and the four interdiffusion coefficients are not sensitive to the solute concentrations. The ratio of indirect coefficient to direct one suggests that repulsive interactions exist between Al and Cr atoms in the Ti–Al–Cr alloys. In addition, the ratio values of converted interdiffusion coefficients in the ternary alloys suggest that the interactions between Ti (solvent) and Cr atoms are attractive in the present alloy.
