Assessment of Atomic Mobilities in fcc Al-Ag-Zn Alloys

Abstract

Based on various experimental diffusivities of fcc Al-Ag-Zn alloys available in the literature and the thermodynamic parameter evaluated in the present work, atomic mobilities of Al, Ag and Zn in the fcc Al-Ag-Zn system were assessed as a function of composition and temperature with the aid of DICTRA software. Comparison between the calculated diffusivities and the corresponding experimental data indicates that the presently obtained atomic mobilities can reproduce most of the diffusivities, such as tracer diffusivities, impurity diffusivities and interdiffusivities in both binary and ternary systems. The reliability of the atomic mobilities was further verified via comparisons between the model-predicted concentration-distance profiles of the binary and ternary diffusion couples and the experimentally measured ones. Good agreement between the calculated and the measured concentration-distance profiles indicates that the presently obtained atomic mobilities are reliable. The diffusion paths can be also reproduced by the presently obtained atomic mobilities.