Enhanced densification of zinc powders through thermal cycling

C. A. Schuh*, David C Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The densification of zinc powders by uniaxial hot pressing is investigated under both isothermal and thermal cycling conditions. Thermal cycling results in enhanced densification kinetics as compared to isothermal compaction at the upper cycle temperature. Using mechanistic models of initial-stage powder densification, the experimental data are analyzed to reveal the creep stress-exponent and activation energy of the dominant densification mechanism. Consequently, the observed densification enhancement during thermal cycling is confirmed to be due to internal stress plasticity, which is produced by internal mismatch stresses between adjacent zinc grains with anisotropic thermal expansion.

Original languageEnglish (US)
Pages (from-to)1349-1358
Number of pages10
JournalActa Materialia
Volume50
Issue number6
DOIs
StatePublished - Apr 2 2002

Keywords

  • Hot pressing
  • Powder consolidation
  • Superplasticity
  • Thermal expansion
  • Zinc

ASJC Scopus subject areas

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

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