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Superplastic constitutive equation and rate-controlling process in aluminum matrix composites with discontinuous fiber and particle reinforcements

Published online by Cambridge University Press:  31 January 2011

Mamoru Mabuchi  and
Kenji Higashi
Mamoru Mabuchi
Affiliation:
National Industrial Research Institute of Nagoya, Hirate-cho, Kita-ku, Nagoya 462, Japan
Kenji Higashi
Affiliation:
College of Engineering, Department of Mechanical Systems Engineering, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka 593, Japan
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Abstract

Superplastic behavior of aluminum matrix composites with discontinuous reinforcements has been investigated in a temperature range below the melting temperature measured by differential scanning calorimetry. The experimental results of the mechanical properties revealed that the rate-controlling process of superplastic flow was associated with dislocation movement controlled by lattice self-diffusion. The strengthening due to the presence of reinforcements was retained. It is suggested that the strongest strengthening process of the dislocation-pileup mechanism and the diffusional relaxation-limitation or dislocation bypass mechanism affects the rate-controlling process.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 3 , March 1998 , pp. 640 - 648
Copyright
Copyright © Materials Research Society 1998

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