Thermodynamic properties of metastable Ag-Cu alloys

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)3144-3149
Journal / PublicationJournal of Applied Physics
Volume74
Issue number5
Publication statusPublished - 1 Sept 1993
Externally publishedYes

Abstract

The enthalpies of formation of metastable fcc Ag-Cu solid solutions, produced by ball milling of elemental powders, were determined by differential scanning calorimetry. Experimental thermodynamic data for these metastable alloys and for the equilibrium phases are compared with both calculation of phase diagrams (CALPHAD) and atomistic simulation predictions. The atomistic simulations were performed using the free-energy minimization method (FEMM). The FEMM determination of the equilibrium Ag-Cu phase diagram and the enthalpy of formation and lattice parameters of the metastable solid solutions are in good agreement with the experimental measurements. CALPHAD calculations made in the same metastable regime, however, significantly overestimate the enthalpy of formation. Thus, the FEMM is a viable alternative approach for the calculation of thermodynamic properties of equilibrium and metastable phases, provided reliable interatomic potentials are available. The FEMM is also capable of determining such properties as the lattice parameter which are not available from CALPHAD calculations.

Citation Format(s)

Thermodynamic properties of metastable Ag-Cu alloys. / Najafabadi, R.; Srolovitz, D. J.; Ma, E. et al.
In: Journal of Applied Physics, Vol. 74, No. 5, 01.09.1993, p. 3144-3149.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review