Interdiffusion and atomic mobility of the Mg–Ag–Zn system

Abstract

Diffusion couples for the Mg–Ag–Zn system were prepared using hcp-Mg single-phase solid solution alloys and pure magnesium (Mg). Their diffusion behaviour at 675–753K was analysed and the related diffusion coefficients were obtained. Combining these experimental results and the thermodynamic description, the atomic mobility parameters were optimised, and the kinetic database of the Mg–Ag–Zn ternary system was constructed for the first time. According to the thermodynamic and kinetic descriptions, the diffusion coefficients for concentration range of hcp-Mg (silver (Ag): 0–3 at% and zinc (Zn): 0–3 at%) were calculated. Finally, the composition and temperature dependence of the interdiffusion coefficients was further discussed using first-principles calculations and thermodynamic factors.

Keywords

• Mg–Ag–Zn system
• Interdiffusion coefficient
• Kinetics