先进材料疑固实验室 Dendrite arm spacing Laboratory of Advanced Materials Solidification Measurement of the secondary dendrite arm spacing,A2,in casting can generally tell local solidification conditions,especially ts. Secondary dendrite arm spacing also has a significant effect on the mechanical properties of cast alloys. ⊕ Reducing the secondary dendrite arm spacing higher strength, higher ductility and higher fracture toughness. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYDendrite arm spacing Measurement of the secondary dendrite arm spacing, λ2, in casting can generally tell local solidification conditions, especially tS. Secondary dendrite arm spacing also has a significant effect on the mechanical properties of cast alloys. Reducing the secondary dendrite arm spacing  higher strength, higher ductility and higher fracture toughness