Abstract
We explore the feasibility of vacancy condensation as the void-nucleating
mechanism underlying ductile fracture by void growth and coalescence
in single crystals at room temperature. Vacancies are presumed to
be primarily generated by the dragging of intersection jogs. The
equations governing the rate of growth of voids by vacancy condensation
are derived. These equations are used to follow the evolution of
vacancy concentrations and void sizes in the Wang and Anderson Acta
metall. 39, 779 (1991) 1 logical and, double bar above9 test.
We find that, when pipe diffusions are taken into account, the time
required for the nucleation of a macroscopic void in the near-tip
region is of the order of one minute, which is well within the time-scale
of quasistatic fracture tests.
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