Journal article
Consolidation of particles by severe plastic deformation: Mechanism and applications in processing bulk ultrafine and nanostructured alloys and composites
K Xia
Advanced Engineering Materials | WILEY-V C H VERLAG GMBH | Published : 2010
Abstract
Severe plastic deformation (SPD) can be used to consolidate particles into bulk ultrafine and nanostructured materials. SPD consolidation relies on plastic deformation of individual particles, rather than diffusion, to achieve bonding and thus can be carried out at much lower temperatures. Using examples of consolidation of Al particles by back pressure equal channel angular pressing (BP-ECAP), it is demonstrated that full consolidation is achieved when the particles are sheared to disrupt the surface oxide layer whereas consolidation is impossible or incomplete in the case of particles sliding over each other. The effects of particle characteristics such as size, shape, strength and surface..
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Funding Acknowledgements
I am indebted to the following researchers who have contributed to the development of the SPD consolidation process at the University of Melbourne: W. Xu, X. Wu, S. Goussous, E. W. C. Lui, C. Froidevaux, P. Luo, Y. S. Wu, J. Li and H. Xie. Support from the Australian Research Council with the ARC Centre of Excellence for Design in Light Metals is gratefully acknowledged.