Abstract
In many materials, divacancies are formed readily and migrate more rapidly than monovacancies. The presence of divacancies may alter the net fluxes of vacancies to sinks in irradiated materials, and thus influence the void swelling or the irradiation creep of the material. In this paper we calculate the sink strengths for cavities and dislocations when monovacancies associate to form divacancies. These sink strengths can be significantly different from the standard values obtained in the absence of divacancy formation. We then use these sink strengths to calculate the growth rates of cavities, and find that the presence of divacancies can alter these growth rates significantly. However, in spite of the large differences in the sink strengths in the presence of divacancies, in most cases the ‘standard’ sink strengths give reasonably accurate values for the growth rate of cavities.
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