Densification mechanisms of spark plasma sintering: multi-step pressure dilatometry

The effects of electrical current and mechanical pressure on the densification of spherical copper powder during spark plasma sintering (SPS) are examined. A novel multi-step pressure dilatometry method is introduced to compare the constitutive behavior of the copper powder under nearly equivalent c...

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Bibliographic Details
Published in:Journal of materials science 2012-10, Vol.47 (20), p.7036-7046
Main Authors: Li, Wei, Olevsky, Eugene A., McKittrick, Joanna, Maximenko, Andrey L., German, Randall M.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Copper
Copper products
Creep (materials)
Crystallography and Scattering Methods
Densification
Density
Dilatometry
Dislocation density
Dislocation mobility
Equivalence
Materials Science
Plasma sintering
Polymer Sciences
Powders
Predictive control
Pressure effects
Sintering
Sintering 2011
Solid Mechanics
Spark plasma sintering
Spherical powders
Strain rate sensitivity
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Summary:The effects of electrical current and mechanical pressure on the densification of spherical copper powder during spark plasma sintering (SPS) are examined. A novel multi-step pressure dilatometry method is introduced to compare the constitutive behavior of the copper powder under nearly equivalent current-insulated and current-assisted SPS process conditions. The strain rate sensitivity agrees with that predicted for a dislocation climb-controlled creep densification mechanism for both processing setups. Accelerated densification rate leading to a higher final relative density is observed for the current-assisted SPS.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-6515-y