Enhanced densification of Ti-6Al-4V powders by transformation-mismatch plasticity

Bing Ye, Marc R. Matsen, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The densification kinetics of Ti-6Al-4V powders with spherical or angular shapes are compared in uniaxial die pressing experiments between isothermal conditions (at 1020 °C, in the β-field, where deformation occurs by creep) and thermal cycling (between 860 and 1020 °C, within the range of the α-β phase transformation of the alloy, where transformation-mismatch plasticity is activated). Densification kinetics are only moderately affected by powder shape, but are markedly faster under thermal cycling than under isothermal conditions, as expected from the higher deformation rate achieved under transformation-mismatch plasticity conditions as compared to creep conditions. The densification curves for both creep and mismatch plasticity deformation mechanisms are successfully modeled for various applied stresses and for partial cycling, when transformation is incomplete. Tensile properties of specimens fully densified under thermal cycling conditions are similar to literature values from Ti-6Al-4V densified by isothermal hot isostatic pressing.

Original languageEnglish (US)
Pages (from-to)3851-3859
Number of pages9
JournalActa Materialia
Volume58
Issue number11
DOIs
StatePublished - Jun 2010

Keywords

  • Hot pressing
  • Phase transformations
  • Powder consolidation
  • Superplasticity
  • Titanium

ASJC Scopus subject areas

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

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