Abstract
An analysis of the probability distribution function of particles randomly dispersed in a solid has been applied to cavitation during superplastic deformation and a method of predicting cavity coalescence developed. Cavity size distribution data were obtained from quantitative metallography on specimens of two microduplex nickel-silver alloys deformed superplastically to various extents, at elevated temperature, and then compared to theoretical predictions from the model. Excellent agreement occurred for small void sizes, but the model underestimated the number of voids in the largest size groups. It is argued that the discrepancy results from a combination of effects due to non-random cavity distributions and to enhanced growth rates and incomplete spheroidization of the largest cavities.
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