Interdiffusion and Thermodynamic Forces in Binary Liquid Alloys

Abstract:

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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.

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Periodical:

Edited by:

A. Roósz, V. Mertinger, P. Barkóczy and Cs. Hoó

Pages:

481-486

DOI:

10.4028/www.scientific.net/MSF.649.481

Citation:

A. Griesche et al., "Interdiffusion and Thermodynamic Forces in Binary Liquid Alloys", Materials Science Forum, Vol. 649, pp. 481-486, 2010

Online since:

May 2010

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$35.00

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