Papers by Keyword: Steady State Deformation

Abstract: Severe plastic predeformation of crystalline materials leads not only to formation of a steady-state dislocation structure including low-angle boundaries, but also brings the high-angle boundary structure into a steady state. When the steady-state flow stress is high enough, the material becomes ultrafine-grained or even nanocrystalline. The change from coarse-grained to ultrafine-grained is accompanied by a distinct change in the steady-state deformation resistance that is measured after predeformation. This is explained by two opposing effects of high-angle boundaries, namely enhanced dislocation storage and accelerated dislocation recovery. The first one causes net hardening at high temperature-normalized strain rate Z (Zener–Hollomon), the second one net softening at low Z. This means that the rate-sensitivity of the flow stress is enhanced, which causes the paradoxon of enhanced strength at enhanced ductility. Tests with abrupt large changes of deformation conditions bring the strain associated with dynamic recovery into the focus. The results of such tests indicate that the boundaries, low-angle as well as high-angle ones, migrate under concentrated stress during deformation and thereby contribute to straining and recovery. The corresponding system of differential equations needed to model structure evolution and deformation kinetics on a semi-empirical basis is briefly discussed.

Abstract: Plastic deformation of crystalline materials is not controlled by interaction among free dislocations only, but the interaction of free dislocations with internal boundaries. i) Low-angle boundaries: Modeling of deformation of pure materials with conventional grain size on the basis of structure evolution indicates that low-angle boundaries act as obstacles of free dislocations. The migration of the low-angle boundaries constitutes an essential recovery process determining the deformation resistance in the steady state. ii) High-angle boundaries: Severe plastic deformation transforms low-angle boundaries into high-angle ones. They differ in obstacle and recovery characteristics from low-angle boundaries, which explains the special properties of ultrafine-grained and nanocrystalline materials with regard to strength, strain rate sensitivity and ductility. iii) Phase boundaries in Ni-base superalloys enhance the strengthening by hard phases with strengthening by dense dislocation networks serving to reduce coherency stresses. It is concluded that internal boundaries play a crucial role in controlling the evolution of structure and strength in crystalline materials.