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Internal Stresses in Bulk Metallic Glass Matrix Composites

Published online by Cambridge University Press:  17 March 2011

Ersan Üstündag ,
Danut Dragoi ,
Bjorn Clausen ,
Donald Brown ,
Mark A. M. Bourke ,
Dorian K. Balch  and
David C. Dunand
Ersan Üstündag
Affiliation:
Department of Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
Danut Dragoi
Affiliation:
Department of Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
Bjorn Clausen
Affiliation:
Department of Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
Donald Brown
Affiliation:
Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Mark A. M. Bourke
Affiliation:
Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Dorian K. Balch
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
David C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
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Abstract

Composites consisting of a bulk metallic glass (BMG) matrix and metallic fibers or particulates have been shown to exhibit superior mechanical properties as compared to monolithic BMGs. To understand the role of reinforcements in this improvement, it is necessary to investigate the state of internal stresses in these composites. These stresses arise from the thermal expansion mismatch between the reinforcement and the matrix, as well as the elastic and plastic incompatibilities between the two phases. Neutron diffraction and synchrotron X-ray diffraction were used to measure these mismatch-induced stresses in BMG-matrix composites with various reinforcements: continuous W fibers, W or Ta particles, and dendritic, in-situ formed precipitates. The results are compared to numerical and analytical predictions of internal stresses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L9.3
Copyright
Copyright © Materials Research Society 2001

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