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Critical assessments of accommodation process by liquid phase for superplastic flow in Si3N4/Al–Mg–Si metal matrix composites

Published online by Cambridge University Press:  31 January 2011

Mamoru Mabuchi ,
Hajime Iwasaki ,
Ha-Guk Jeong ,
Kenji Hiraga  and
Kenji Higashi
Mamoru Mabuchi
Affiliation:
National Industrial Research Institute of Nagoya, Hirate-cho, Kita-ku, Nagoya 462, Japan
Hajime Iwasaki
Affiliation:
Department of Materials Science, College of Engineering, Himeji Institute of Technology, Shosha, Himeji, Hyogo 671–22, Japan
Ha-Guk Jeong
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1-1, Aoba-ku, Sendai 980, Japan
Kenji Hiraga
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1-1, Aoba-ku, Sendai 980, Japan
Kenji Higashi
Affiliation:
Department of Mechanical Systems Engineering, College of Engineering, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka 593, Japan
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Abstract

A liquid phase serves to relax stress concentrations caused by sliding at interfaces and grain boundaries in high-strain-rate superplasticity for aluminum matrix composites. However, the presence of a liquid phase does not always lead to high-strain-rate superplasticity because too much liquid causes decohesion at a liquid phase. The critical conditions of the optimum distribution, thickness, and volume in a liquid phase are discussed based on the observation results by differential scanning calorimetry and transmission electron microscopy. As a result, a very thin and discontinuous liquid phase is required both to assist relaxation of the stress concentrations and to limit decohesion at a liquid phase.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2332 - 2336
Copyright
Copyright © Materials Research Society 1997

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