High strain rate superplasticity of a {beta}-Si{sub 3}N{sub 4} whisker reinforced pure aluminium composite made by squeeze casting

Journal Article · Wed May 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00024-3· OSTI ID:247985

Imai, T ^[1]; Tochigi, I ^[2]; Ai, K ^[3]; L`Esperance, G; Hong, B ^[4]

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1. National Industrial Research Inst. of Nagoya (Japan)
2. Kanagawa High-Technology Foundation, Kawasaki (Japan)
3. Industrial Research Inst. of Kanagawa, Yokohama (Japan)
4. Ecole Polytechnique de Montreal, Quebec (Canada)

High strain rate superplasticity (HSRS) in ceramic whisker or particulate reinforced aluminum alloy composites is expected to offer an efficiently near-net shape forming technique to automobile, aerospace, and even semi-conductor industries, since the HSRS composites usually exhibit a total elongation of 250--600% at a high strain rate of about 0.1--10 s{sup {minus}1}. It is thought that primary deformation mechanism of the HSRS is grain boundary sliding since the composites have the fine grain size of 3{approximately}0.8 {micro}m. The purpose of this study is to develop a thermomechanical processing route to produce a fine microstructure and a HSRS in a {beta}-Si{sub 3}N{sub 4} whisker reinforced 99.99% pure aluminum composite fabricated by squeeze casting. In addition, superplastic deformation mechanism of the composite are also discussed.

• OSTI ID: 247985
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM
AUTOMOBILES
CASTING
COMPOSITE MATERIALS
DEFORMATION
ELONGATION
GRAIN BOUNDARIES
GRAIN SIZE
INTERFACES
PLASTICITY
SILICON NITRIDES
STRAIN RATE
THERMOMECHANICAL TREATMENTS