Enhanced densification of metal powders by transformation-mismatch plasticity

C. Schuh*, P. Noël, D. C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

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 languageEnglish (US)
Pages (from-to)1639-1653
Number of pages15
JournalActa Materialia
Volume48
Issue number8
DOIs
StatePublished - May 11 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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