Undercooling of droplet solidification for molten pure aluminum

The effects of droplet size and cooling rate on the undercooling of droplet solidification were investigated in the present paper, and the relation between the droplet size and cooling rate versus the undercooling was obtained by DSC. It is shown that the undercooling increases with the decrease of droplet size and increase of cooling rate. Moreover, it is interesting to find that the undercooling and its change rate increase significantly with the droplet size below 20 μm on condition that the cooling rate remains unchanged. Additionally, it is a novelty that the change trend of undercooling decreases with the increasing cooling rate.