Article ID Journal Published Year Pages File Type
1448469 Acta Materialia 2009 11 Pages PDF
Abstract

The mechanical behaviour and microstructure evolution of nanocrystalline palladium was investigated. Material with an initial grain size ∼10 nm was prepared by inert gas condensation. Instrumented high-pressure torsion straining was used to characterize the flow stress during plastic deformation to shear strains up to 300. A change in primary deformation mechanism was induced by stress-induced grain growth. For grain sizes <40 nm, grain boundary mediated processes (shear banding, grain boundary sliding and grain rotation) controlled the deformation, with dislocation slip, twinning, and grain boundary diffusion providing the accommodation. For larger grain sizes, the operative deformation mechanism was dislocation slip.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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