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Dsc Evaluations in F.c.c. Solid Solutions of Short-range-order Kinetics As Influenced by Bound Vacancies

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Abstract

A modified first order kinetic law, which describes the roles of bound and unbound vacancies, is proposed in order to predict defect decay and short-range-order kinetics of quenched binary alloys during linear heating experiments. The model has been applied to differential scanning calorimetry (DSC) curves of Cu–5 at%Zn quenched from different temperatures. Activation energy for migration of solute-vacancy complexes was also assessed from the kinetics of short-range-order using DSC traces. A value of 89.5±0.32 kJ mol–1 was obtained. The relative contribution of bound and unbound vacancies to the ordering process as influenced by quenching temperature was determined. In conjunction, a parametric study of the initial total defect concentration and effective energy for defect migration was performed in order to envisage their influence on the calculated DSC profiles.

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Authors and Affiliations

  1. Facultad de Ciencias Físicas y Matemáticas, Instituto de Investigaciones y Ensayes de Materiales, IDIEM, Universidad de Chile, Casilla 1420, Santiago, Chile

    A. Varschavsky & E. Donoso

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  1. A. Varschavsky
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  2. E. Donoso
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Varschavsky, A., Donoso, E. Dsc Evaluations in F.c.c. Solid Solutions of Short-range-order Kinetics As Influenced by Bound Vacancies. Journal of Thermal Analysis and Calorimetry 63, 397–413 (2000). https://doi.org/10.1023/A:1010140409219

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