Microstructure and Mechanical Properties of Al-5Cu-4.5Mg-2.5Zn Squeeze Cast Alloy  

作　　者：SUN Yonggen WANG Yanchun SU Yanni SONG Xujie DU Lanjun CHENG Yuansheng DU Zhiming 孙永根;WANG Yanchun;SU Yanni;SONG Xujie;DU Lanjun;CHENG Yuansheng;杜之明(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin,150001,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China;Beijing North Vehicle Group Co.Ltd.,Beijing,100072,China;Beijing Aerospace Propulsion Institute,Beijing,100076,China)

机构地区：[1]National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin,150001,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China [3]Beijing North Vehicle Group Co.Ltd.,Beijing,100072,China [4]Beijing Aerospace Propulsion Institute,Beijing,100076,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第5期977-985,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the International Cooperation Project of the Ministry of Science and Technology of China (No. 2014DFR50320);the National Natural Science Foundation of China (No. 51174064)。

摘　　要：Al-5Cu-4.5Mg-2.5Zn alloy was prepared and the alloy ingots were fabricated by squeeze casting in this work.Considering these negative effects of composition segregation and coarse second phases,some heat treatments were adopted in this research.Microstructures,element distribution,phase constitutions and mechanical properties of Al-5Cu-4.5Mg-2.5Zn alloy ingots before and after heat treatments were investigated.It was discovered that these heat treatments would influence and extremely optimize the microstructures and properties of Al-5Cu-4.5Mg-2.5Zn alloy.Except some residual S (Al_(2)CuMg) phase and a few of η phase,the precipitate free zone (PFZ) and the Guinier Preston zone (GPZ) formed in the alloy.It was also found that θ′′ (Al_(2)Cu) and η′′ (MgZn_(2)) phases formed and kept a consistent relationship with the aluminum matrix.As the result,these properties of ultimate tensile strength (UTS),percentage of elongation and Brinell hardness (HB) were greatly elevated.The UTS,percent of elongation and HB were 469 MPa,8.1% and 208 N/mm^(2),respectively.

关 键 词：Al-Cu-Mg-Zn alloy squeeze casting heat treatments second phases mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]