Abstract
Dislocations of aluminium crystals grown under high vacuum ( P ⩽ 10 -8 torr) by secondary recrystallization at the expense of primary recrystallization cubic texture grains were investigated by X-ray Lang topography. We could see that quasi-linear dislocations, with Burgers vectors making an angle of 60° with dislocation lines arise from segmented helical-type dislocations present in these crystals. The origin of the latter type dislocations is ascribed to the climbing of screw dislocations under the small supersaturation of vacancies which form in the crystals during cooling. A generation mechanism of screw or quasi-screw dislocations associated with the boundary migration of secondary crystals (38° (22°) 〈111〉 Kronberg-Wilson boundary) is also described.
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