MODELLING STRENGTHENING MECHANISMS IN SOLIDS USING DISLOCATION DYNAMICS

摘要

The mechanical properties of crystalline solids are inherently a function of their microstructure which in turn is governed by processing of the material. Although advances in understanding the structure-property relationships have been achieved, more basic research to expand the knowledge base is certainly needed. Recent work on exploring the strengthening effect of particles and grain-boundaries in a crystalline solid, using the fundamental approach of dislocation dynamics, is presented. Whenever appropriate, comparisons to experimental findings or theoretical models are made. The work demonstrates the power and limitations of such simulation methodology. In particular some basic physics of the interaction between dislocations and these microstructural features are revealed.