先进材料疑固实验室 Dendrite arm spacing Laboratory of Advanced Materials Solidification Due to the radius of the dendritic tips highly relies on the growth speed,the above equation can be written as: 4.3(△ToDT0.25 k0.25v0.25VG ⊕ The above equation shows temperature gradient G is more important than growth speed v. where D is the diffusion coefficient,I is the Gibbs-Thomson coefficient (/S),6 is the surface energy,S is the fusion entropy,I is the growth speed,k the partition coefficient,47 is the liquidus-solidus range at Co. 上游文通大学 SHANGHAI JIAO TONG UNIVERSITYDendrite arm spacing Due to the radius of the dendritic tips highly relies on the growth speed, the above equation can be written as: The above equation shows temperature gradient G is more important than growth speed v. where D is the diffusion coefficient, Г is the Gibbs-Thomson coefficient (δ/ΔSf ), δ is the surface energy, ΔSf is the fusion entropy, V is the growth speed, k the partition coefficient, ΔT0 is the liquidus-solidus range at C0