Influence of minor cerium addition on microstructure and fluidity of as-cast Al-Cu-Mn-Mg alloy  

作　　者：Yishan Wang Yu Bai Kaixi Jiang Wenxue Fan Puxuan Wang Hai Hao 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China [2]Ningbo Research Institute of Dalian University of Technology,Ningbo 315016,China

出　　处：《Journal of Rare Earths》2025年第2期377-383,I0006,共8页稀土学报(英文版)

基　　金：Project supported by the National Natural Science Foundation of China (52171030);the Key Basic Research Project of the Basic Strengthen Program (2021-JCJQ-ZD-043-00);the National Key Research and Development Program of China (2018YFA0702903)。

摘　　要：Al-Cu-Mn alloys are widely used to produce automobile components like cylinder heads and engine blocks because of their capability to retain excellent thermal and mechanical characteristics at high temperatures.However,the Al-Cu-Mn-based alloys demonstrate restricted fluidity,leading to casting defects such as shrinkage and incomplete filling.This research investigated the microstructure and fluidity of Al-4.7Cu-1.0Mn-0.5Mg(wt%)alloy with minor cerium(Ce)addition.The as-cast alloys predominantly compriseα-Al matrix,accompanied by the presence of Al_(2)Cu,Al_(6)Mn,and Al_(8)Cu_(4)Ce phases.The influence of adding Ce on the fluidity of the Al-4.7Cu-1.0Mn-0.5Mg alloy was investigated using a trispiral fluidity test mold in this research.The findings suggest that the addition of Ce within the range of 0.1 wt%to 0.5 wt%in the Al-4.7Cu-1.0Mn-0.5Mg alloy results in an enhancement in fluidity.Specifically,the alloy containing 0.4 wt%Ce exhibits a significant increase in fluidity distance,from 349.7 to 485.7 mm.This improvement can be attributed to the reduction in viscosity,the refinement of secondary dendrite arm spacing,and the modification of secondary phase particles.However,a higher concentration of Ce leads to a decrease in fluidity length,potentially due to the formation of Al_(8)Cu_(4)Ce.

关 键 词：Al-Cu-Mn-Mg alloy Rare earths Ce addition MICROSTRUCTURE FLUIDITY 

分 类 号：TG1[金属学及工艺—金属学]