Disorientations during plastic deformation and their effect on work-hardening: Seminar at School of Materials Science and Engineering at Chongqing University
Activity: Other › Other (prizes, external teaching and other activities) - External teaching and subject coordination
Wolfgang Pantleon - Speaker
- Risø National Laboratory for Sustainable Energy
- Materials Research Division
- Metal Structures in Four Dimensions
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.
21 Mar 2011