Computer simulation of creation and motion of dislocations during plastic deformation in copper

Dislocations were created near the center of the surface (1 1̄ 0) of a copper small crystal whose surfaces are (1 1 1), (1̄ 1̄ 1̄), (1 1̄ 0), (1̄ 1 0), (1 1 2̄), and (1̄ 1̄ 2) by use of n-body embedded atom potential and molecular dynamics. A Heidenreich–Shockley partial dislocation, not a perfect dislocation, was created. As the partial dislocation proceeds, the partial dislocation and the surface were connected with a stacking fault until the next Heidenreich–Shockley partial dislocation was created at the surface. Just before the creation of a partial dislocation the stress was the highest. A very sharp yield stress was observed. Copper small crystals with a notch were pulled or compressed. Again Heidenreich–Shockley partial dislocations were created near the notch.