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

Dislocations were created near the center of the surface (1 (1) over bar 0) of a copper small crystal whose surfaces are (1 1 1), ((1) over bar (1) ov er bar (1) over bar), (1 (1) over bar 0), ((1) over bar 1 0), (1 1 (2) over bar), and ((1) over bar (1) over bar 2) by use of n-body embedded atom pot ential 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 fa ult until the next Heidenreich-Shockley partial dislocation was created at the surface. Just before the creation of a partial dislocation the stress w as the highest. A very sharp yield stress was observed. Copper small crysta ls with a notch were pulled or compressed. Again Heidenreich-Shockley parti al dislocations were created near the notch. (C) 2001 Elsevier Science B.V. All rights reserved.