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A quantitative analysis of cavitation in Al–Cu–Mg metal matrix composites exhibiting high strain rate superplasticity

Published online by Cambridge University Press:  31 January 2011

Shuichi Wada ,
Mamoru Mabuchi ,
Kenji Higashi  and
Terence G. Langdon
Shuichi Wada
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089–1453
Mamoru Mabuchi
Affiliation:
National Industrial Research Institute, Hirate-cho, Kita-ku, Nagoya 462, Japan
Kenji Higashi
Affiliation:
Department of Mechanical Systems Engineering, College of Engineering, Osaka Prefecture University, Sakai, Osaka 593, Japan
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089–1453
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Abstract

Specimens of two Al–Cu–Mg (2124) composites, reinforced with 20 vol% of either Si3N4 particulates or Si3N4 whiskers, were tested under experimental conditions close to those for optimum high strain rate superplasticity. Both composites developed extensive internal cavitation during testing, but quantitative measurements show that significant cavity growth occurs throughout the test in the whisker-reinforced composite, but only at strains ≥1.0 in the particulate-reinforced composite. This difference in behavior is attributed to differences in the extent of a discontinuous liquid phase at the grain boundaries and at the matrix/reinforcement interfaces. It is concluded that the presence of an extensive liquid phase in the particulate-reinforced composite is beneficial for attaining high ductility because it relieves the stress concentrations from grain boundary sliding and thereby limits the growth of cavities.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1755 - 1764
Copyright
Copyright © Materials Research Society 1996

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