Introduction of dislocation 上清充通大￥ SHEAMGRAI DUD TONO UHTVEREETTY Edge vs.screw dislocation A dislocation may be defined as 1)the line marking the boundary between slipped and unslipped sections of a slip plane. 2)a disturbed region between two substantially perfect parts of a crystal. 3)a linear defect around which some of the atoms are misaligned. Type of dislocation Dislocation Property Edge Screw Relation between dislocation line(t)and b ⊥ 川 Slip direction l川tob II tob (the 'direction'of step created when dislocation leaves the crystal) Direction of dislocation line movement relative to b 1 ⊥ Process by which dislocation may leave slip plane* climb Cross-slip Institute of Forming Technology Equipment 8Introduction of dislocation Institute of Forming Technology & Equipment 8 Edge vs. screw dislocation Dislocation Property Type of dislocation Edge Screw Relation between dislocation line (t) and b  || Slip direction (& the ‘direction’ of step created when dislocation leaves the crystal) || to b || to b Direction of dislocation line movement relative to b ||  Process by which dislocation may leave slip plane* climb Cross‐slip A dislocation may be defined as 1) the line marking the boundary between slipped and unslipped sections of a slip plane. 2) a disturbed region between two substantially perfect parts of a crystal. 3) a linear defect around which some of the atoms are misaligned