Model of Structural Fragmentation Induced by High Pressure Torsion

0347197 - ÚTIA 2011 RIV RU eng J - Článek v odborném periodiku
Kratochvíl, J. - Kružík, Martin - Sedláček, R.
Model of Structural Fragmentation Induced by High Pressure Torsion.
Reviews on Advanced Materials Science. Roč. 25, č. 1 (2010), s. 88-98. ISSN 1606-5131. E-ISSN 1605-8127
Výzkumný záměr: CEZ:AV0Z10750506
Klíčová slova: High-pressure torsion * intergranular glide * homogeneous deformation mode
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.649, rok: 2010
http://library.utia.cas.cz/separaty/2010/MTR/kruzik-model of structural fragmentation induced by high pressure torsion.pdf

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.
Trvalý link: http://hdl.handle.net/11104/0188029