先进材料疑固实验室 Unidirectional Solidification Laboratory of Advanced Materials Solidification From the lectures on solidification of single phase alloys,we know that to grow columnar grains or single crystals,the temperature gradient,G and the growth velocity,R,need to satisfy the following condition: L mLCo(1-k) ≥ (24) kDL (6) This means that G must increase with increasing the growth rate, R. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYFrom the lectures on solidification of single phase alloys, we know that to grow columnar grains or single crystals, the temperature gradient, GL and the growth velocity, R, need to satisfy the following condition: This means that GL must increase with increasing the growth rate, R. (6) Unidirectional Solidification