Cavitational effects during creep in polycrystalline alumina
Cavitation in deformed fine-grained Al/sub 2/O/sub 3/ was studied as a function of deformation temperature and strain rate. Three distinct cavity profiles were observed in varying proportions depending on the temperature and loading rate. Symmetrically shaped equilibrium cavities were observed at low stress and temperature. Crack-like (nonequilibrium) cavities were observed at higher stress and temperature. Full-facet cavities were observed as the end product of crack-like cavity growth and as a precursor to coalescence. These observations provide strong support for the cavity growth model developed by Chuang, et al. and establish cavitation as an important deformation and failure mechanism in ceramic materials.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6694655
- Report Number(s):
- LBL-11830
- Country of Publication:
- United States
- Language:
- English
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