CHANGE OF CRYSTAL ORIENTATION IN STRAINING AND DISLOCATION GLIDE SYSTEMS

Copper single crystals subjected to compressive creep at 773 K changed the crystallographic orientation of their longitudinal direction, cho sen as a direction of loading. In compressive deformation the change m oves the longitudinal direction to the normal of the slip plane. This fact is utilized in the present paper to an investigation of the possi ble activity of dislocation slip systems on non-compact crystal planes . The results show that the average change of orientation can be inter preted well by an activity of compact [110] {111} slip systems. Local deviations from the average final orientation can indicate a non-compa ct glide but a connection with substructure misorientations is expecte d, too. There are microstructural indications of dislocation cross-sli p to {100}, {110} and (probably) {131} non-compact slip planes.