Abstract
Superplastic deformation behavior is simulated in 2 dimensions by incorporating the mechanisms of grain boundary diffusion and concurrent grain growth of both static and dynamic growths. The relationship between microstructural changes and mechanical properties is examined under various loading conditions. Although grain boundary diffusion produces an increase in the aspect ratio of grains, for large grain boundary mobility, the increase is restricted by the rapid migration of the grain boundary. With increasing aspect ratio, the stress exponent decreases and the grain size exponent increases, which are 1 and 3 for equiaxed grains, respectively. From the observation of the simulated microstructures, it is also found that grain boundary sliding is related with the migration of grain boundaries.
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