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Journal Article

Model of Structural Fragmentation Induced by High Pressure Torsion

Kratochvíl J., Kružík Martin, Sedláček R.

: Reviews on Advanced Materials Science vol.25, 1 (2010), p. 88-98

: CEZ:AV0Z10750506

: High-pressure torsion, intergranular glide, homogeneous deformation mode

: http://library.utia.cas.cz/separaty/2010/MTR/kruzik-model of structural fragmentation induced by high pressure torsion.pdf

(eng): 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.

: BM

07.01.2019 - 08:39