Abstract
High-temperature superplasticity in Al2O3-20vol%spinel (MgAl2O4) containing 5,10, 20 and 30vol% of ZrO2 was examined at temperatures between 1400 and 1500°C. The dispersion of ZrO2 significantly reduces the flow stress during tensile tests in comparison with pure Al2O3-20vol%spinel. Flow stress around 10 MPa arc obtained at 1450°C for 20vol% and 30vol%ZrO2 materials and at a strain rate of 1.3×10-4s-1. The flow stress reduction is explained by a decrease in grain growth due to ZrO2 dispersion and by a high increase in diffusion through Do parameter.
Original language | English |
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Pages (from-to) | 537-542 |
Number of pages | 6 |
Journal | Materials Science Forum |
Volume | 304-306 |
DOIs | |
Publication status | Published - 1999 |
Externally published | Yes |
Keywords
- Alumina
- Ceramics
- Magnesia spinel
- Superplasticity
- Zirconia
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering