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The Heterogeneous Character of Phase Transformations Caused by Limited Vacancy Mobility

Published online by Cambridge University Press:  11 February 2011

Wolfgang Püschl ,
William A. Soffa  and
Wolfgang Pfeiler
Wolfgang Püschl
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
William A. Soffa
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, 842 Benedum Hall, Pittsburgh, PA 15261, U.S.A.
Wolfgang Pfeiler
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
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Abstract

In homogeneous phase transformations the order parameter proceeds towards equilibrium uniformly in all microvolumes of the system. However, defect-mediated diffusion (vacancy mechanism) involving local atomic jump processes during the early stages of transformation kinetics can produce discrete regions within which the order parameter has changed significantly embedded in an unperturbed matrix. This effect is evident in order-order transformations in B2 FeAl as measured by residual resistivity. An estimate of the heterogeneity regime is calculated in terms of vacancy diffusion parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB4.10
Copyright
Copyright © Materials Research Society 2003

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