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Analysis of Vacancy Agglomeration Processes by Matusita’s Method for B2 FeAl

Published online by Cambridge University Press:  14 March 2011

Kyosuke Yoshimi ,
Masafumi Tsunekane  and
Kouichi Maruyama
Kyosuke Yoshimi
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
Masafumi Tsunekane
Affiliation:
Department of Materials Science and Engineering, University of Michigan, MI 48109-2099, U.S.A.
Kouichi Maruyama
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
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Abstract

In this study, the exothermic DSC peaks observed in rapidly-solidified Fe-44.9at.%Al ribbons and water-quenched Fe-48.5at.%Al single crystals were analyzed by Matusita’s method in order to discuss the kinetics of the agglomeration processes of supersaturated vacancies. Both the nucleation and morphological factors, n and m, respectively were approximately 3 for the rapidly solidified ribbons and were approximately 2 for the water-quenched single crystals. Based on the Matusita’s idea, the m values suggest the growth of 3-dimensional voids in the rapidly solidified ribbons and the growth of 2-dimensional dislocations loops in the single crystals due to the agglomeration of supersaturated vacancies. In addition, the n values suggest that the nuclei of voids and dislocation loops existed in as-quenched samples. These interpretations are in good agreement with the results of TEM observations.

Keywords

differential thermal analysis (DTA)FeAl
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-09
Copyright
Copyright © Materials Research Society 2011

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