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Decomposition and thermodynamic property of metastable Fe–Zn solid solutions produced by mechanical alloying

Published online by Cambridge University Press:  31 January 2011

F. Zhou ,
Y. T. Chou  and
E. J. Lavernia
F. Zhou*
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697-2575
Y. T. Chou
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697-2575
E. J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616-5294, and Department of Chemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697-2575
*
a)Address all correspondence to this author.fzhou@uci.edu
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Abstract

Thermal decomposition of supersaturated single-phase body-centered cubic (bcc) Fe100−xZnx (5≤ x ≤65 at.%) solid solutions, processed via mechanical alloying of high-purity metal powders, was investigated using x-ray diffraction and differential scanning calorimetry (DSC). At elevated temperatures the metastable solid solution decomposed into a stable equilibrium aggregate consisting of the pure bcc Fe phase and an intermetallic compound Fe4Zn9. The decomposition temperature decreased with increasing Zn concentration. The enthalpy of decomposition for various Fe–Zn solid solutions measured by the DSC was in the range of 1.2–3.5 kJ/mol. The enthalpy of mixing of the as-milled solid solutions from elemental Fe and Zn powders was estimated to be 0.5–1.7 kJ/mol. In addition, the activation energies of decomposition for these solid solutions were determined on the basis of the Kissinger analysis, and their values appeared to be independent of the Zn concentration in the alloy, with an average of 147 ± 17 kJ/mol.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3230 - 3236
Copyright
Copyright © Materials Research Society 2002

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