Abstract:To investigate the diffusion reaction between Ti/Al solid diffusion couple, Ti/Al alternate foils formed by hot pressing were annealed at 525, 550, 575 and 600 °C for time ranging from 1 to 40 h. The experimental results show that TiAl₃ was the only observed phase at Ti/Al interface. The interface thermodynamics favored the preferential formation of TiAl₃ in Ti/Al couple. The growth of TiAl₃ layer occurred mainly towards Al foil side and exhibited a parabolic law. Using the interdiffusion coefficients calculated based on the contribution of grain boundary diffusion, the growth of TiAl₃ was simulated numerically with the finite difference method, and the simulated results were in good agreement with the experimental ones.

Key words: hot pressing; diffusion couple; TiAl₃; finite difference method; numerical simulation