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Processing of high-strain-rate superplastic Si3N4w/Al–Mg–Si composites

Published online by Cambridge University Press:  03 March 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:
Department of Mechanical Systems Engineering, College of Engineering, University of Osaka Prefecture, Gakuen-cho, Sakai, Osaka, 591, Japan
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Abstract

Effects of reduction, reinforcements, and dynamic precipitation on grain refinement by hot extrusion have been investigated in a Si3N4w/Al-Mg-Si (6061) composite by tensile tests and microstructural investigation. The grain refinement was attributed to an interaction of recrystallization and dynamic precipitation, which was enhanced by reinforcements. Not only fine-grained microstructure, but also relaxing stress concentrations which are caused at matrix/reinforcement interfaces during superplastic flow are required to attain large elongations. Partial melting resulting from segregation plays an important role in relaxing the stress concentrations. DSC investigations revealed that the degree of segregation was increased by hot extrusion.

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Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2494 - 2502
Copyright
Copyright © Materials Research Society 1995

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