Diffusion mobilities in the fcc_A1 Cu–Si, Al–Si and Al–Cu–Si alloys

Based on the available thermodynamic parameters and experimental data of self-diffusivity, impurity diffusivity, intrinsic diffusivity, tracer diffusivity and interdiffusivity in the Cu–Si, Al–Si and Al–Cu–Si alloys, the atomic mobilities of Cu, Al and Si in face-centered cubic (fcc_A1) Cu–Si, Al–Si and Al–Cu–Si alloys have been critically assessed as a function of temperature and composition using the CALPHAD-type and DICTRA software package. Comparisons between the calculated and measured coefficients reveal that most of the diffusivities can be reproduced satisfactorily. The obtained mobility parameters can be used to study diffusion-related characteristics for fcc_A1 Cu–Si, Al–Si and Al–Cu–Si alloys.

► The atomic mobilities of fcc Cu–Si, Al–Si and Al–Cu–Si alloys have been assessed.
► The calculated results agree well with various experimental diffusivities.
► The temperature and concentration dependence are taken into consideration.
► The mobility parameters obtained can be used to predict many diffusion phenomena.