先进材料疑固实验室 Morphology control of crystals Laboratory of Advanced Materials Solidification Normally,in steady state,AT;is fairly small,and less than 1K. The temperature gradient in the liquid in front of the S/L interface has a significant effect on the stability of S/L interface. Positive temperature gradient in the liquid>stable S/L interface. Negative temperature gradient in the liquid>unstable S/L interface and formation of solid dendrites. For single element solids,the morphology of the crystal depends on microstructure of the interface(surface type)and the temperature distribution in front of the interface. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYMorphology control of crystals Normally, in steady state, ∆Ti is fairly small, and less than 1K. The temperature gradient in the liquid in front of the S/L interface has a significant effect on the stability of S/L interface. • Positive temperature gradient in the liquid  stable S/L interface. • Negative temperature gradient in the liquid  unstable S/L interface and formation of solid dendrites. For single element solids, the morphology of the crystal depends on microstructure of the interface (surface type) and the temperature distribution in front of the interface