Flow Effects on Mush Coarsening
Gradient annealing experiments of a near-eutectic AlCu30 alloy with artificial stirring induced by a rotating magnetic field (RMF) of 6 mT were performed. The specific surface area of the primary phase was measured on metallographic sections perpendicular to the sample axis with a fixed amount of fraction solid. The variation of the specific surface area with fluid flow is compared to flow free experiments: the specific surface area varies as the inverse cube root of annealing time if no RMF is applied, but varies as an inverse forth root at 6 mT. The experimental procedure and results are presented in detail and discussed with models of convective coarsening of dendrites.
A. Roósz, V. Mertinger, P. Barkóczy and Cs. Hoó
G. Kasperovich et al., "Flow Effects on Mush Coarsening", Materials Science Forum, Vol. 649, pp. 409-414, 2010