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Effect of Excess Vacancies on Antiphase Domain Growth in Fe3Al

Published online by Cambridge University Press:  26 February 2011

Y. Koizumi ,
T. Hagiwara ,
Y. Minamino  and
N. Tsuji
Y. Koizumi
Affiliation:
Department of Adaptive Machine Systems, Osaka University 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
T. Hagiwara
Affiliation:
Department of Adaptive Machine Systems, Osaka University 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
Y. Minamino
Affiliation:
Department of Adaptive Machine Systems, Osaka University 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
N. Tsuji
Affiliation:
Department of Adaptive Machine Systems, Osaka University 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
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Abstract

The growth of the D03-type antiphase domain (APD) in Fe3Al was investigated focusing on the effect of excess vacancies that were introduced during the quenching process from the disordered state. The variation in the APD size exhibited considerable deviation from the conventional “parabolic growth law” in the early stage of APD growth. This variation was numerically calculated on the assumption that the migration of the APD boundaries was enhanced by non-equilibrium excess vacancies and the vacancy concentration decreased during the isothermal annealing for the APD growth. The calculated variations in the APD size could be successfully fitted to the experimental results in cases with quenching temperatures (Tq) of 873 K or 1073 K, but not when Tq was 1273 K. The APD growth in the latter case was much slower than the expected growth derived from the calculation. This discrepancy was attributed to the rapid decrease in the vacancy concentration due to vacancy clustering since a significant amount of dotted contrasts were observed in TEM image of only the specimen quenched from 1273K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.20
Copyright
Copyright © Materials Research Society 2005

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References

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