先进材料疑固实验室 Dendrite arm spacing Laboratory of Advanced Materials Solidification The semi-axis length,a,is given by the difference between the tip temperature and the root temperature,divided by the mean temperature gradient in the mushy zone: AT'T-Ts' a= G G ct a is the semi-axis length,AT is To given by the difference between △T the tip temperature T*and the root a s G temperature T's,divided by the Te mean temperature gradient in the mushy zone.T's is the solidus Co b=0.58λ1 temperature of the solid part at the root part. 上游文通大学 SHANGHAI JIAO TONG UNIVERSITYDendrite arm spacing The semi-axis length, a, is given by the difference between the tip temperature and the root temperature, divided by the mean temperature gradient in the mushy zone: a is the semi-axis length, ΔT is given by the difference between the tip temperature T* and the root temperature T’s, divided by the mean temperature gradient in the mushy zone. T’s is the solidus temperature of the solid part at the root part