Abstract
Superplastic flow behavior in 1 mol%GeO 2 and 1 mol%NdO 1.5 co-doped tetragonal ZrO 2-3 mol%Y 2O 3 polycrystal (3Y-TZP) was examined at 1400°C under an initial strain rate of 1.3 × 10 -4 s -1, 1 mol%GeO 2 or NdO 1.5-doping slightly enhances high-temperature ductility in 3Y-TZP, but 1 mol%GeO 2 and 1 mol%NdO 1.5 co-doped TZP exhibits large elongation to failure of more than 600%. The large ductility in TZP due to Ge 4+ and Nd 3+ co-doping can be explained by reduced flow stress. High-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDS) analysis revealed that Y 3+, Ge 4+ and Nd 3+ cations segregate in the vicinity of grain boundaries in the present materials. The segregation width of the dopant cation across the grain boundaries in GeO 2 and NdO 1.5 co-doped TZP is larger than that in GeO 2 or NdO 1.5 singly doped TZP. The reduction of the flow stress due to GeO 2 and NdO 1.5 co-doping is probably related to the increment in the segregation width.
| Translated title of the contribution | Effect of GeO 2 and NdO 1.5 co-doping on high-temperature ductility in TZP |
|---|---|
| Original language | Japanese |
| Pages (from-to) | 1084-1088 |
| Number of pages | 5 |
| Journal | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |
| Volume | 69 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2005 Dec |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry