Enhanced densification of zinc powders through thermal cycling

TitleEnhanced densification of zinc powders through thermal cycling
Publication TypeJournal Article
Year of Publication2002
AuthorsSchuh, CA, Dunand, DC
JournalActa Materialia
Volume50
Issue6
Pagination1349 - 1358
Date Published2002/04/02/
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. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.