Three-dimensional dislocation dynamics simulation of plastic deformation in copper single crystal
(English)Manuscript (preprint) (Other academic)
Dynamic deformation of single crystal copper at high strain rates ranging from 103 to 105 s-1 is modeled using three dimensional discrete dislocation dynamics method. Numerical uniaxial tensile test is performed on a model crystal along [0 0 1] orientation to examine the resulting macroscopic behavior along with microstructure evolution at high strain rates. Twenty-four straight dislocations of mixed character are randomly distributed inside a model crystal with an edge length of 1 subjected to period boundary conditions. In the simulated single crystal with the considered initial dislocation microstructure, plastic flow demonstrates a significant strain rate dependency at imposed strain rates. Rate sensitivity of flow stress observed at strain rates >> 103 s-1 agrees well with the reported experimental studies on copper single crystal. Furthermore, strain rate considerably affects the microstructure evolution of the sample crystal as a result of influence of strain rate on dislocations generation and interactions. Formation of heterogeneous microstructure is observed at all imposed strain rates. We find that heterogeneity of microstructure escalates as strain rate increases.
Dislocation dynamics, plastic deformation, Cu single crystal, high strain rate deformation
Metallurgy and Metallic Materials
Research subject Materials Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-175413OAI: oai:DiVA.org:kth-175413DiVA: diva2:860849
QS 20152015-10-142015-10-142015-10-14Bibliographically approved