Abstract
Published measurements of the coarsening parameter K = (r32r3o)/t of particulate silicon in Al – Si alloy base matrices are compared with values predicted for volume diffusion control according to the LSW model corrected for finite volume fraction. While some measurements are within a factor of 10 of LSW predictions, others exceed these by factors as high as 103 to 104. Possible reasons for such large apparent enhancements of coarsening rate are discussed.
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