Bauschinger Effect Analysis in Polycrystalline Copper: an Atomistic Simulation

Bauschinger effect has been analyzed in polycrystalline copper using the molecular dynamic simulation. The models of polycrystalline copper have 10 and 20 grains and it is deformed at a constant strain rate of 109 s−1. In the polycrystalline copper, yielding is observed by nucleation of 1/6 < 112 > Shockley partial dislocation. The interaction between dislocations has been noticed during subsequent cyclic deformation. Generation of stacking faults and twining occur in tensile loading, while removal of stacking faults and de-twining are noted during unloading and reloading in the reverse direction. Moreover, cyclic softening is appreciated by the reduction in total dislocation line length.