Efficiency of Dislocation as a Sink for Vacancies in Deformed Aluminum

Abstract

The annealing of vacancies in deformed aluminum was studied by electrical resistance measurements. The remarkable results are summarized as follows (i) decay rate of vacancies decreases with the increase of strain ε for the deformation, in spite of the high density of dislocations introduced by the deformation, (ii) the apparent activation energy which was determined by the change of slope method during the annealing becomes larger with the strain, (iii) the jump number of vacancy in deformed specimens has an almost constant value during the annealing for each specimen. These results are explained in terms of the efficiency of dislocation as a sink for vacancies, and it is concluded that the main contribution to the efficiency comes from the line tension of dislocations constrained geometrically.