Journal of alloys and compounds vol:378 issue:1-2 pages:102-106
The fragmentation of fcc metals during plastic deformation is modelled as a process of nucleation and growth of fragment boundary segments. Groups of excess dislocation formed in double cross-slip (DCS) events and trapped at cell walls are proposed as nuclei. End stresses around the tips of these groups are proposed to control their growth. Since the end lines of excess dislocation groups are lines of discontinuity of misorientation, they can be described as partial disclinations. Fragmentation can then be modelled in terms of generation, propagation and immobilisation of partial disclinations. The model has been applied to compression of  copper single crystals at room temperature. The onset of fragmentation, cell wall and fragment boundary spacings as well as fragment boundary misorientation are found in reasonable agreement with experiment. (C) 2004 Elsevier B.V. All rights reserved.