Abstract
Observations on two low-stacking-fault-energy f.c.c. copper alloys are reported which show directly the climb of jogs on serew, edge and mixed dissociated dislocations as a results of irradiation at room temperature with 1 MeV electrons. The observations were obtained using the weak-beam technique to study thin foils in a 100 keV TEM before and after irradiation. However, it is found that under the conditions studied, most of the point defects appear rather to form small loops along the core of the partial dislocations, provided these have an edge component. This can result in an increase or a decrease in the dissociation width and in certain cases in the formation of constrictions.