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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Effect of Solute Diffusion on Dendrite Growth in the Molten Pool of Al-Cu Alloy

Journal:METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE

Key Words:CELLULAR-AUTOMATON MODEL TO-EQUIAXED TRANSITION FRONT-TRACKING METHOD PHASE-FIELD LATTICE BOLTZMANN GRAIN-GROWTH SOLIDIFICATION SIMULATION MORPHOLOGIES PREDICTION

Abstract:A cellular automaton (CA)-finite difference model is developed to simulate dendrite growth and solute diffusion during solidification process in the molten pool of Al-Cu alloy. In order to explain the interaction between the dendritic growth and solute distribution, a series of CA simulations with different solute diffusion velocity coefficients are carried out. It is concluded that the solute concentration increases with dendrite growing and solute accumulation in the dendrite tip. Converged value of the dendrite tip growth velocity is about 480 mu m/s if the mesh size is refined to 2 mu m or less. Growth of the primary dendrite and the secondary dendrite is mainly influenced by solute diffusion at the dendrite tips. And growth of secondary and tertiary dendrites is mainly influenced by solute diffusion at interdendrite.

ISSN No.:1073-5615

Translation or Not:no

Date of Publication:2017-10-01

Co-author:Gu, Cheng,Liu Yunpeng,Wei Yanhong

Correspondence Author:Xiaohong Zhan