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Effect of processing on Charpy impact toughness of metallic glass matrix composites

Published online by Cambridge University Press:  18 May 2011

Carl Zachrisson ,
Henry Kozachkov ,
Scott Roberts ,
Georg Kaltenboeck ,
Robert D. Conner ,
Marios D. Demetriou ,
William L. Johnson  and
Douglas C. Hofmann
Carl Zachrisson
Affiliation:
Jet Propulsion Laboratory/California Institute of Technology, Pasadena, California 91109
Henry Kozachkov
Affiliation:
California Institute of Technology, Pasadena, California 91126
Scott Roberts
Affiliation:
California Institute of Technology, Pasadena, California 91126
Georg Kaltenboeck
Affiliation:
California Institute of Technology, Pasadena, California 91126
Robert D. Conner
Affiliation:
California Institute of Technology, Pasadena, California 91126; and California State University—Northridge, Northridge, California 91330
Marios D. Demetriou
Affiliation:
California Institute of Technology, Pasadena, California 91126
William L. Johnson
Affiliation:
California Institute of Technology, Pasadena, California 91126
Douglas C. Hofmann*
Affiliation:
Jet Propulsion Laboratory/California Institute of Technology, Pasadena, California 91109; and California Institute of Technology, Pasadena, California 91126
*
a)Address all correspondence to this author. e-mail: dch@jpl.nasa.gov
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Abstract

In this study, compact Charpy impact testing was used to investigate the effect of processing history and dendrite morphology of bulk metallic glass matrix composites (BMGMCs) on impact toughness. Composite samples were fabricated via suction casting and semisolid forging, and the results were compared with crystalline alloys in the same geometry. A strong dependence on processing was observed, with samples exhibiting up to a 30-fold increase in impact toughness depending on processing and microstructure. Provided that attention is paid to processing techniques, BMGMCs are shown to have properties that equal or surpass some conventionally used crystalline alloys. These properties invite further exploration of these materials in structural applications.

Keywords

AmorphousCompositeSecond phases
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 10 , 28 May 2011 , pp. 1260 - 1268
Copyright
Copyright © Materials Research Society 2011

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