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Grain Growth Impediment of Fe-Based Nanocomposites During Heat Treatment at Elevated Temperature

Published online by Cambridge University Press:  15 February 2011

B. Huang ,
R.J. Perez  and
E.J. Lavernia
B. Huang
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California, 92717-2575, U.S.A.
R.J. Perez
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California, 92717-2575, U.S.A.
E.J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, California, 92717-2575, U.S.A.
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Abstract

Cryogenic ball milling of Fe-10 wt.%Al in liquid argon is shown to produce a nanocrystalline microstructure with high thermal stability against grain growth. The experimental evidence suggests that this stability may originate from the presence of fine γ-Al2O3 particles which pin the Fe grain boundaries. In contrast, Fe3O4 particles formed during cryomilling of Fe in liquid nitrogen were not able to impede grain growth during consolidation at 823 K. The interactions between the γ-Al2O3 particles and the grain boundaries during growth may be described by Gladman's theory. Additional stabilization against grain growth may have been provided by the presence of Al at the Fe grain boundaries. Following annealing at 1223 K, the grain size of the Fe-10 wt.%Al powders cryomilled in liquid argon was 13.3 ± 7.9 nm, but it exceeded 1700 nm following annealing at 1373 K. The loss of nanocrystalline structure may be attributed to the Ostwald ripening of γ-Al2O3 particles, resulting in abnormal grain growth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 37
Copyright
Copyright © Materials Research Society 1996

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