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Model of Structural Fragmentation Induced by High Pressure Torsion
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SYSNO ASEP 0347197 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Model of Structural Fragmentation Induced by High Pressure Torsion Author(s) Kratochvíl, J. (CZ)
Kružík, Martin (UTIA-B) RID, ORCID
Sedláček, R. (DE)Number of authors 3 Source Title Reviews on Advanced Materials Science - ISSN 1606-5131
Roč. 25, č. 1 (2010), s. 88-98Number of pages 11 s. Language eng - English Country RU - Russian Federation Keywords High-pressure torsion ; intergranular glide ; homogeneous deformation mode Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10750506 - UTIA-B (2005-2011) UT WOS 000280468300012 Annotation The paper analyzes mechanisms of ultra-fine grain substructure formation as observed in high pressure torsion (HPT) experiments. Accepting that HPT shearing is achieved by intergranular glide (M. Hafok and R. Pippan, Scripta Materialia, 56:757-760, 2007) the fragmentation process is interpreted within the framework of crystal plasticity. The deformation is treated as a plastic flow though the adjustable crystal lattice fragmented into misoriented regions. The basic feature of the substructure formation is an effective rotation of the slip systems approaching asymptotically the observed steady state. The fragmentation is interpreted as an instability of the homogeneous deformation mode. It is proposed that the rotation causes a continuous reconstruction of the substructure pattern. The hindered destruction of the previous pattern leads to enhanced hardening. Workplace Institute of Information Theory and Automation Contact Markéta Votavová, votavova@utia.cas.cz, Tel.: 266 052 201. Year of Publishing 2011
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