Deformation mechanisms in nanocrystalline palladium at large strains |
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Authors: | Yu Ivanisenko L Kurmanaeva J Weissmueller K Yang J Markmann H Rösner T Scherer H-J Fecht |
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Affiliation: | 1. Institute of Nanotechnology, Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany;2. Universität des Saarlandes, Technische Physik, 66041 Saarbrücken, Germany;3. Institute of Micro and Nanomaterials, University of Ulm, Albert-Einstein-Allee 47, 89091 Ulm, Germany;4. Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany |
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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. |
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