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Effect of In-Situ Formation of Nanoscale γ-Al2O3 and AlN on Thermal Stability of Cryomilled Nanocrystalline Fe

Published online by Cambridge University Press:  15 February 2011

R.J. Perez ,
B. Huang  and
E.J. Lavernia
R.J. Perez
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92717
B. Huang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92717
E.J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92717
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Abstract

Cryogenic attritor milling (cryomilling) is used to synthesize nanocrystalline Fe-10wt.%Al powders. Following consolidation in a rigid die at 823 K and heat treatment for 1 hour at 1223 K, an average grain size of 16±7 nm is maintained. This level of thermal stability is shown to exceed that of pure Fe processed under identical conditions. The significant increase in thermal stability is attributed primarily to the presence of nanometer-scale γ-Al2O3 and AIN dispersoids formed during cryomilling and subsequent heat treatment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 31
Copyright
Copyright © Materials Research Society 1996

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