The influence of an ordering transition on the interdiffusion in Au-Cu alloys
- Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany). Inst. fuer Metallkunde
The concentration dependencies of the interdiffusion coefficient, {tilde D}(c), have been determined with the aid of electron probe microanalysis at 11 temperatures above and below the temperature T{sub ord} of the A1-L1{sub 2} (Cu{sub 3}Au) ordering transition. At temperatures T > T{sub ord} there are minima on these dependencies near the Cu{sub 3}Au composition. Slightly below T{sub ord} the {tilde D}(c) dependencies are monotonous. At T < (T{sub ord} {minus} 20 K) maxima appear on {tilde D}(c) which grow with decreasing temperature. Such a behavior is explained by the concentration dependence of the thermodynamic factor {Phi}. Dependencies {Phi} (c, T) have been calculated within the framework of the tetrahedron approximation of the cluster variation method. The calculated dependencies are in good agreement with the experimental data.
- OSTI ID:
- 55335
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 5 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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