Crystal orientation effect on dislocation nucleation and multiplication in FCC single crystal under uniaxial loading

摘要: Abstract Molecular dynamics simulations are applied to study the effects of orientation and presence structural defects on compression/tension (C/T) asymmetry copper single crystals. In addition perfect crystal, crystals with stacking fault tetrahedra, as a representative internal defect, considered investigate both homogeneous heterogeneous deformation mechanisms. Both normal stresses slip plane relative values Schmid factor in compression tension impact C/T asymmetry. The an SFT lowers stress required for plastic deformation, but this effect is highly dependent crystal loading direction. reduction yield larger than almost all orientations. Results show that general defect would decrease copper, corresponding closely previous experiments. less sensitive compression, suggesting test more reliable experimental tool future size dependence studies, since main reason behind observed materials. On other hand, constant orientations, testing geometry efficient determine stress.