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Nucleation of (Mo) Precipitates on Dislocations During Annealing of a Mo-rich Mo5SiB2 Phase

Published online by Cambridge University Press:  26 February 2011

Nobuaki Sekido ,
Ridwan Sakidja  and
John H. Perepezko
Nobuaki Sekido
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509, University Ave, Madison, WI 53706, USA
Ridwan Sakidja
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509, University Ave, Madison, WI 53706, USA
John H. Perepezko
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509, University Ave, Madison, WI 53706, USA
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Abstract

Upon annealing an as-cast Mo-10Si-20B alloy at high temperatures, a Mo solid solution phase precipitates within a supersaturated Mo5SiB2 phase. The precipitation behavior of the Mo solid solution was investigated by means of transmission electron microscopy and X-ray diffractometry. It is found that the Mo5SiB2 phase in a Mo-10Si-20B alloy contains a significant amount of structural vacancies in the as-cast state. The excess vacancies are removed to form dislocations during annealing, which provides the heterogeneous nucleation sites for the (Mo) precipitates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.35
Copyright
Copyright © Materials Research Society 2005

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