| Autor: |
C. Huvier, M. Grosbras |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Powder Technology. 80:111-117 |
| ISSN: |
0032-5910 |
| DOI: |
10.1016/0032-5910(94)02847-8 |
| Popis: |
Cu-0.3 wt.% Al powder compacts with various green densities were subjected to laser–driven shock waves. Specimens were then characterized in terms of Vickers microhardness and microstructure. Photomicrographs and image analysis were used to study the residual porosity in the compacts. Results show no significant residual porosity in the near-surface region, the porosity then rising to a maximum depth depending on the initial green density. Shock hardening occurred in all cases. The hardness increased by 180% to 380% as the starting porosity varied from 133% to 32%. The microhardness results correlate reasonably well with those obtained from image analysis: powder particle deformation capacity was significantly higher in the more porous sample, while shock wave attenuation occurred more rapidly. An optimum initial value of porosity for densification was found to be 20%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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