Prediction of grain structure in direct-chill cast Al-Zn-Mg-Cu billets using,cellular automaton-finite element method  

作　　者：Min-Seok Kim Sang-Hwa Lee Jae-Gil Jung Kwangjun Eah 

机构地区：[1]Department of Materials Science and Engineering,Gachon University,Seongnam-su 13120,Republic of Korea [2]Metallic Materials Division,Korea Institute of Materials Science,Changwon 51508,Republic of Korea [3]Department of Materials Science and Engineering,Yonsei University,Seoul 03722,Republic of Korea

出　　处：《Progress in Natural Science:Materials International》2021年第3期434-441,共8页自然科学进展·国际材料（英文版）

基　　金：the Strategic Material Development Program(No.10062304);the Ministry of Trade,Industry&Energy,Republic of Korea.

摘　　要：A cellular automaton-finite element(CA-FE)model was used to predict the solidification grain structure of permanent mold cast A7086 alloy.In this model,a Gaussian distribution of nucleation sites was adopted,and the Kurz-Giovanola-Trivedi model was extended to a multicomponent Al-Zn-Mg-Cu alloy system to determine the growth kinetics of the dendrite tip.For describing the Gaussian distribution of nucleation sites on the mold surface,an empirical relationship between the initial cooling rate of the melt and the nucleation density was proposed.Under various casting conditions,the calculated grain structures agreed well with the experimental results.Subsequently,the model was applied to the direct-chill(DC)cast billets,and the simulated grain structures reproduced well the experimental results.This confirmed that the current CA-FE model can be used practically and effectively in DC casting processes.

关 键 词：Cellular automaton-finite element(CA-FE) model Direct-chill casting Al-Zn-Mg-Cu alloy A7068 alloy Grain structure 

分 类 号：TG146.21[一般工业技术—材料科学与工程]