Diffusion and atomic mobility of BCC Ti-Al-Nb alloys: Experimental determination and computational modeling

Diffusion behavior in BCC Ti-Al-Nb ternary alloys was investigated at 1473 K by the experimental solid-state diffusion couple technique. The extraction of inter- and impurity diffusion coefficients, by the Whittle-Green and generalized Hall methods respectively, enables the diffusion properties of BCC Ti-Al-Nb alloys to be constructed at the Ti-rich corner. The determined diffusion data, together with those from the literature, have been thoroughly evaluated and then assessed to develop the atomic mobility for the BCC Ti-Al-Nb ternary alloys. The validated mobility parameters have been applied to predict a full diffusion picture of the Ti-Al-Nb BCC alloys and interesting interdiffusion behavior of the diffusion experiments.