先进材料疑固实验室 Secondary arm spacing Laboratory of Advanced Materials Solidification The average spacing between secondary dendrite arms,A2,is largely determined by the contact time between the arms and the liquid. This contact time is equal to the local solidification time,ts. ⊕ The following relationship between A2 and ts,has been established through experimental study: 入2=5.5M/8 With M= Toin) m(-k)(co-c)Cm is ofter equal to Ce,eutectic concentration. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYSecondary arm spacing The average spacing between secondary dendrite arms, λ2, is largely determined by the contact time between the arms and the liquid. This contact time is equal to the local solidification time, tS. The following relationship between λ2 and ts, has been established through experimental study: With Cl m is ofter equal to Ce, eutectic concentration