Evaluation of experimental data of diffusion in semiinfinite two-phase systems with nonstationary interphase boundary by means of thermal potentials II. Application of the theory to the diffusion characteristics determination

Abstract

In this work, the survey of twelve final relations for the diffusion characteristics calculation from the experimental data under the assumption of the interphase boundary movement in time according to the parabolic law is presented. The diffusivities determination can be performed by means of four methods which utilize the knowledge of the area below the concentration curves and the knowledge of the concentration gradients on the interphase boundary. The presented relations were applied to the diffusion evaluation of Al in the Ni₃Al-Ni system atT=1100°C from the published data by two author teams. The calculated diffusivity values had mostly a smaller dispersion that the values obtained by means of the Matano-Boltzmann method. The new procedures of the diffusivity evaluation can be utilized with advantage in the cases when the diffusivity concentration dependence is little significant.