Enhanced densification of zinc powders through thermal cycling

C. A. Schuh; D. C. Dunand

doi:10.1016/S1359-6454(01)00439-6

Enhanced densification of zinc powders through thermal cycling

C. A. Schuh^*, D. C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

24 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 language	English (US)
Pages (from-to)	1349-1358
Number of pages	10
Journal	Acta Materialia
Volume	50
Issue number	6
DOIs	https://doi.org/10.1016/S1359-6454(01)00439-6
State	Published - 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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10.1016/S1359-6454(01)00439-6

Cite this

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title = "Enhanced densification of zinc powders through thermal cycling",

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.",

keywords = "Hot pressing, Powder consolidation, Superplasticity, Thermal expansion, Zinc",

author = "Schuh, {C. A.} and Dunand, {D. C.}",

note = "Funding Information: This study was supported by the National Science Foundation through grant DMR-9987593. C.S. additionally acknowledges the support of the University of California, Lawrence Livermore National Laboratory, under US Department of Energy contract No. W-7405-Eng-48.",

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T1 - Enhanced densification of zinc powders through thermal cycling

AU - Schuh, C. A.

AU - Dunand, D. C.

N1 - Funding Information: This study was supported by the National Science Foundation through grant DMR-9987593. C.S. additionally acknowledges the support of the University of California, Lawrence Livermore National Laboratory, under US Department of Energy contract No. W-7405-Eng-48.

PY - 2002/4/2

Y1 - 2002/4/2

N2 - 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.

AB - 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.

KW - Hot pressing

KW - Powder consolidation

KW - Superplasticity

KW - Thermal expansion

KW - Zinc

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DO - 10.1016/S1359-6454(01)00439-6

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EP - 1358

JO - Acta Materialia

JF - Acta Materialia

IS - 6

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Enhanced densification of zinc powders through thermal cycling

Abstract

Keywords

ASJC Scopus subject areas

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