Abstract
Investigating the heterogeneous nucleation is of high importance due to the fact that the nucleation is a sign of the occurrence of solidification. The present study presents the influence of droplet size and cooling rate on the undercooling of Au solidified on Al2O3 substrate. The results show that the undercooling is proportional to cooling rate and inversely proportional to droplet size. In addition, the influence of droplet size on undercooling can be enlarged if the higher cooling rate is employed, whereas the influence of cooling rate on undercooling can be enlarged if the smaller droplet size is selected. The underlying reasons are discussed by formulating the relationship between undercooling, cooling rate and droplet size.
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