Response of partitioning to cooling rate for different solutes in aluminum alloys  

作　　者：Jiang You Cheng Wang Dong Qiu Si-Yu Chen Ze-Tian Liu Hui-Yuan Wang 

机构地区：[1]National Key Laboratory of Automotive Chassis Integration and Bionics,Jilin University,Changchun 130025,China [2]Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Jilin University,Changchun 130025,China [3]State Key Laboratory of Reliability and Intelligence of Electrical Equipment,School of Material Science and Engineering,Hebei University of Technology,Tianjin 300130,China [4]Center for Additive Manufacturing,School of Engineering,RMIT University,Melbourne,VIC 3001,Australia

出　　处：《Journal of Materials Science & Technology》2024年第18期155-164,共10页材料科学技术（英文版）

基　　金：Financial support from the National Natural Science Foundation of China(Nos.52222409,52074132,U19A2084);the National Key Research and Development Program(No.2022YFE0122000)are greatly acknowledged.

摘　　要：It is commonly recognized that the cooling rate has a substantial effect on solute partitioning and its resultant microsegregation during solidification.The classical dendrite tip undercooling theory clarifies the mitigation of microsegregation by increasing the cooling rate.However,most of the studies focused on binary alloys,leaving an open question as to whether the microsegregation of different solutes in a multi-component alloy system exhibits a relieving degree similar to increasing cooling rate.Taking a widely used 6022-type Al alloy(Al-0.76Mg-0.93Si-0.2Fe)as a model alloy,the current study reveals that the microsegregation of Mg gets alleviated to the greatest extent,followed by those of Si and Fe when the cooling rate increases from 5 to 128 K/s.This phenomenon is attributed to the solute-based difference in response to partitioning to cooling rate(denoted as Rk).We propose a theoretical equation to quantify Rk,and the R_(k)values of solute Mg,Si,and Fe successfully explain the rank of solute partitioning in exper-iments.Furthermore,a broad range of R_(k)values of other commonly used alloying elements in Al alloys were calculated and ranked,delivering a handy tool to predict the microsegregation behavior and sol-ubility of different solute elements upon sub-rapid solidification,which is consistent with experimental observation.This framework can also be extended to other multi-component alloy systems.

关 键 词：SOLIDIFICATION Cooling rate MICROSEGREGATION Aluminum alloys Solute partitioning 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]