Recent works of superplastic composites
- Univ. of Osaka (Japan). College of Engineering
- Government Industrial Research Institute, Nagoya (Japan)
Superplasticity has been obtained in Metal-Matrix Composites (MMC), include a number of the whisker or particulate-reinforced aluminum matrix composites prepared by conventional powder metallurgy techniques, the groups of the mechanically alloyed aluminum alloys containing about 5 vol % of very fine oxide and carbide particles and a mechanically alloyed 15 vol % SiCp/IN9021 aluminum composite. One of the most important investigations in some of those composites is that the strain rates at which superplasticity took place were very high from 10{sup {minus}1} to 100 s{sup {minus}1} which were three or four orders of magnitude faster than those obtained in the best of the conventional commercial aluminum alloys. The experimental results in composites were reviewed relating to dependencies of the ability of superplasticity on the chemical composition and grain size of matrix and morphology, chemistry and volume fraction of the reinforcements, as well as the nature of the reinforcement-matrix interfaces. It is noted that the superplastic elongation strongly depended on the refinement of the matrix grain structure and the criteria for fracture strength in the interfaces between the matrix and reinforcements.
- OSTI ID:
- 143164
- Report Number(s):
- CONF-930246--; ISBN 0-87339-251-5
- Country of Publication:
- United States
- Language:
- English
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