The interdiffusion coefficient (D̃) has been measured in the temperature range from 1442 to 1639 K as a function of the composition in the α (hexagonal close-packed, A3), α2 (ordered hexagonal, D019), β (body-centred cubic, A2) and γ (ordered face-centred cubic, L10) phases of the Ti-Al system. The concentration profiles were obtained by electron probe microanalysis, and the chemical diffusivity was extracted from the concentration profiles by the Boltzmann-Matano procedure. In all the phases the interdiffusion coefficients increase with increasing Al contents. This increase is large in the disordered phase a, but much smaller in the ordered phases α2 and γ.
|Number of pages||4|
|Journal||International Journal of Materials Research|
|Publication status||Published - 1997 May|