Abstract
Superplastic properties of a 17vol% SiC particulate-reinforced ZK60 magnesium composite was investigated and compared with those of the unreinforced alloy. It was found that the composite, because of its microstructure, exhibited supcrplasticity (elongation-to-failure > 400%) at high strain rates (∼ 0. 1 s-1) . In addition, the material showed a high strain rate sensitivity of 0. 5 and an activation energy of 81kJ/mol in the superplastic region. The unreinforced alloy also exhibited similar results. Direct comparison of the modulus-compensated stress as a function of diffusion- and grain size-compensated strain rate for two materials revealed that the normalized stress of the composite is similar to that of the unreinforced alloy. Based on these results, it was proposed that the dominant deformation mechanisms of both materials are grain boundary sliding accommodated by a grain boundary diffusion process. © 1999 Trans Tech Publications,.
| Original language | English |
|---|---|
| Pages (from-to) | 297-302 |
| Journal | Materials Science Forum |
| Volume | 304-306 |
| DOIs | |
| Publication status | Published - 1999 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Activation energy
- High-strain-rate superplasticity
- Magnesium alloy
- Magnesium-based composite
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