先进材料疑固实验室 Constitutional undercooling Laboratory of Advanced Materials Solidification Due to the non-equilibrium feature of the solidification,the expelled solute during the solidification can not be Co/k distributed into liquid uniformly.Most of solute will accumulate in front of the interface. Co Solute accumulating will lead to the local solidification temperature dropping down to a temperature much lower than original liquid temperature,Co and cause an extra undercooling of local liquid ored Maten 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYConstitutional undercooling Due to the non-equilibrium feature of the solidification, the expelled solute during the solidification can not be distributed into liquid uniformly. Most of solute will accumulate in front of the interface. Solute accumulating will lead to the local solidification temperature dropping down to a temperature much lower than original liquid temperature, C0 and cause an extra undercooling of local liquid