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During plastic deformation dislocations gather into dislocation boundaries and orientation differences across the different types of boundaries arise. The evolution of the disorientations observed by TEM - with an initial increase flowed by saturation - is successfully modelled based on dislocation dynamics taking itno account crystalline symmetry. The effect of disorientations on work-hardening is discussed and the characteristic features of the work-hardening stages are predicted in quantitiative agreement with experiment. Finally, direct monitoring of indiviudal subgrains by high angular resolution x-ray diffraction during tensile deformation is presented and the occurence of different elastic back stresses is rationalized in the same manner as the formation of disorientations.
PlaceChongqing University
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ID: 2371072