Interdiffusion and Thermodynamic Forces in Binary Liquid Alloys
A novel X-ray radiography method is used to measure chemical diffusion in a long-capillary in liquid Al95Ni5 at.-%. Molecular dynamics simulations provide interdiffusion coefficients and thermodynamic factors for the whole composition range in Al-Ni. The data are compared to literature data in Sb-Sn and Ag-Sn. The relation between interdiffusion coefficient and thermodynamic forces is discussed in the context of the Darken equation. In systems with common ordering tendency (Al-Ni, Sb-Sn) the thermodynamic factor is larger than one and enhances interdiffusion. In systems with common demixing tendency (Ag-Sn) the thermodynamic factor is smaller than one and reduces interdiffusion.
A. Roósz, V. Mertinger, P. Barkóczy and Cs. Hoó
A. Griesche et al., "Interdiffusion and Thermodynamic Forces in Binary Liquid Alloys", Materials Science Forum, Vol. 649, pp. 481-486, 2010