A theoretical model for high-strain-rate superplastic behavior of particulate reinforced metal matrix composites
- Hong Kong Polytechnic Univ., Hung Hom (Hong Kong). Dept. of Manufacturing Engineering
Recently, certain discontinuously reinforced aluminum based metal matrix composites (MMCs) have demonstrated high-strain-rate superplasticity. These findings are significant since one of the major shortcomings of conventional superplastic forming process is that the forming rate is too low. Models based on rheology seem to be unable to explain fully the high-strain-rate superplastic behavior of MMCs, particularly if the test temperature is near to the solidus temperature of the material. In view of this, this paper presents a model based on grain boundary sliding and interfacial sliding to explain high-strain-rate superplasticity of MMCs under the condition that a partially continuous film is present at grain boundaries. The theoretical model was verified by experimental findings of a 17 vol.% SiC{sub p}/8090 aluminum-lithium based composite of which the average particle size of the reinforcement phase was 3 {micro}m.
- OSTI ID:
- 237852
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 6 Vol. 33; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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