Dsc Evaluations in F.c.c. Solid Solutions of Short-range-order Kinetics As Influenced by Bound Vacancies |
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Authors: | Varschavsky A Donoso E |
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Institution: | (1) Facultad de Ciencias Físicas y Matemáticas, Instituto de Investigaciones y Ensayes de Materiales, IDIEM, Universidad de Chile, Casilla 1420, Santiago, Chile |
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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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Cu– 5 at%Zn DSC F C C (Face Centered Cubic) kinetics short-range-order solute-vacancy complexes |
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