Solidification of Highly Undercooled Liquid Droplets

摘要

Research has been focused upon metastable phase formation and the controllingphase selection reactions, the evolution of solidification microstructure under the combined influence of undercooling, recalescence and external cooling and several other aspects of undercooled alloy solidification and product structure stability. The experimental approach that has been applied to carry out these studies is based on the droplet emulsion technique. With this method, samples may be produced which exhibit large undercoolings prior to solidification during slow cooling (10-30 deg C/min) and which may be maintained in the metastable undercooled state for extended time periods without the intervention of crystallization. Keywords: Crystallization, Recalescence, External cooling. (kr)