Situation 1:Fully 先进材料疑固实验室 equilibrium solidification Laboratory of Advanced Materials Solidification Assumptions: 1,Solute fully diffuses in both liquid and solid 2.Diffusion speed of solute in liquid and solid is extremely faster than the moving speed of S/L interface. For real situation: Diffusion rate of solute element in liquid D103~105,for a solid, the diffusion rate even smaller. The moving speed of S/L interface is much faster than solute diffusion rate in solid state. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYFor real situation: Diffusion rate of solute element in liquid DL≈10-3~10-5 , for a solid, the diffusion rate even smaller. The moving speed of S/L interface is much faster than solute diffusion rate in solid state. Situation 1: Fully equilibrium solidification Assumptions: 1、Solute fully diffuses in both liquid and solid. 2、Diffusion speed of solute in liquid and solid is extremely faster than the moving speed of S/L interface