Abstract
The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980°C (in the β-field of titanium) and during thermal cycling between 860 and 980°C (about the α/β phase transformation of titanium). Thermal cycling is found to enhance densification kinetics through the emergence of transformation-mismatch plasticity (the mechanism responsible for transformation superplasticity) as a densification mechanism. The isothermal hot-pressing data compare favorably with existing models of powder densification, and these models are successfully adapted to the case of transformation-mismatch plasticity during thermal cycling. Similar conclusions are reached for the densification of titanium powders containing 1, 5, or 10 vol.% ZrO2 particles. However, the addition of ZrO2 hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.
Original language | English (US) |
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Pages (from-to) | 1639-1653 |
Number of pages | 15 |
Journal | Acta Materialia |
Volume | 48 |
Issue number | 8 |
DOIs | |
State | Published - May 11 2000 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys