Interdiffusion between Ti and the alloy was studied at 1273 to 1373K. Boltzmann-Matano and Hall’s methods were used to evaluate the interdiffusion coefficients. The microstructure of the TZM/Ti interface showed excellent contact for all specimens bonded above 1273K. The reaction index (n) evaluated by layer growth kinetics was close to 2. Interdiffusion coefficients increased with the increase in Ti concentration, and a quadratic relationship could be determined between the activation energy and concentration of Ti. Impurity diffusion coefficients of Mo in Ti and the activation energy for diffusion of Mo in Ti were evaluated. A linear dependence between the activation energy and pre-exponential factor for interdiffusion could be established. The diffusion parameters for TZM/Ti in the present studies were also compared with previous work on the Mo/Ti system. There appeared to exist a good correlation between the two studies.

Interdiffusion Studies between a Mo-Based Alloy and Ti. A.Laik, G.B.Kale, K.Bhanumurthy: Metallurgical and Materials Transactions A, 2006, 37[10], 2919-26