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Size effects in powder compaction

Published online by Cambridge University Press:  31 January 2011

J. Gil Sevillano
J. Gil Sevillano
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Guipúzcoa (CEIT) and Faculty of Engineering (TECNUN, University of Navarra), P.O. Box 1555, 20080 San Sebastián, Spain
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Abstract

It is well known that great difficulties are encountered in the cold compaction of ultrafine powders. Such difficulties have been qualitatively attributed to several origins (e.g., increasing relative contribution of oxidized layers to particle resistance as particle size decreases). The main densification stage during compaction is governed by plastic deformation at interparticle contacts under pressure. On account of the strength enhancement of plastic resistance in presence of plastic strain gradients (physically resolved by “geometrically necessary dislocations”) a contribution to the size effect on powder compaction efficiency is here predicted. Some quantitative experimental data available are in good agreement with this explanation.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1238 - 1240
Copyright
Copyright © Materials Research Society 2001

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