Abstract

A study has been made, by solving a thermal problem, of the temperature fields and heat flows in solidifying aluminum granules and also of their cooling rates and crystallization dynamics as functions of particle size at constant heat removal intensities and at intensities varying with time. Criteria of optimum metal granule solidification have been introduced, with the aid of which suitable thermal conditions of granule solidification have been determined enabling a type of cooling to be chosen ensuring an optimum structure in cast granules. Thermal stresses have been investigated on the assumption of granules being isotropic elastic solids. Their existence has been confirmed by the character of the dislocation structure forming in metal granules under various cooling conditions. The time dependence of the intensity of heat removal resulting in minimum thermal stresses has been established. Practical recommendations are given for the cooling of aluminum granules during their manufacture.

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