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

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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.

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Author notes

  1. Shuichi Wada

    Present address: Mechanical Engineering Department, Sony Corporation, Osaki Technology Center, Tokyo, 2-10-14 Osaki, 141, Shinagawa-ku, Japan

Authors and Affiliations

  1. Departments of Materials Science and Mechanical Engineering, University of Southern California, California, 90089–1453, Los Angeles, USA

    Shuichi Wada & Terence G. Langdon

  2. National Industrial Research Institute, Nagoya, 462, Hirate-cho, Kita-ku, Japan

    Mamoru Mabuchi

  3. Department of Mechanical Systems Engineering, College of Engineering, Osaka Prefecture University, Osaka, 593, Sakai, Japan

    Kenji Higashi

Authors
  1. Shuichi Wada
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  2. Mamoru Mabuchi
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  3. Kenji Higashi
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  4. Terence G. Langdon
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Wada, S., Mabuchi, M., Higashi, K. et al. A quantitative analysis of cavitation in Al–Cu–Mg metal matrix composites exhibiting high strain rate superplasticity. Journal of Materials Research 11, 1755–1764 (1996). https://doi.org/10.1557/JMR.1996.0220

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  • DOI: https://doi.org/10.1557/JMR.1996.0220

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