CRYSTAL PLASTICITY ANALYSIS OF DISLOCATION EMISSION FROM MICRO VOIDS

Slip deformation in the vicinity of a micro void in metal crystals is analyzed by a crystal plasticity technique, and the geometrically necessary dislocations, which accompany the gradient of plastic shear strain on slip systems, are evaluated. Aggregates of dislocation segments on pairs of slip systems that have the same slip directions but different slip planes exhibit a rhombus-shaped structure, and the structure is shown to be equivalent to prismatic dislocation loops of the interstitial type. Material transport and growth of voids are discussed in terms of GN dislocations