Effect of copper addition on precipitation behaviors and mechanical properties of Mg-Zn-Cu alloys with respect to high zinc  

作　　者：Ye Zhou Shengli Li Pingli Mao Xingang Ai Qinghe Xiao Zheng Liu 

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,PR China [2]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,PR China [3]Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province,PR China

出　　处：《Journal of Magnesium and Alloys》2024年第12期5194-5204,共11页镁合金学报(英文)

基　　金：financial support from the National key research and development program(2021YFB3702005);National Natural Science Foundation of China(51974155);Major Science and Technology Projects of Liaoning Province(2020JH1/10100001);Outstanding Young Scientific and Technological Talents Project of University of Science and Technology Liaoning(2023YQ07);the High-level innovation team of Liaoning Province(XLYC1908006)。

摘　　要：The current work deals with the precipitation behaviors and mechanical properties of the high zinc content of the Mg-Zn-Cu system alloys using gravity casting.Differential scanning calorimetry(DSC)was conducted to describe the solidification process and precipitation behaviors.Thermodynamic calculations were carried out to determine the precipitation conditions using the Thermo-calc software.The microstructures were characterized by an optical microscope(OM),scanning electron microscope(SEM),electron probe micro analysis(EPMA),transmission electron microscopy(TEM),and confocal laser scanning microscope(CLSM).Tensile tests and micro-hardness tests were applied to investigate the mechanical properties.The results substantiated that the Mg Zn Cu phase precipitates in Cu-containing alloys and that the precipitate content,as well as the precipitate temperature,increased with the Cu content from 0 to 3 wt.%according to the thermodynamic calculations and the DSC results.The measured micro-hardness of the alloy was 53.2,57.9,55.8,and 52.5 VHN,respectively.The ultimate tensile strength(UTS),yield strength(YS),and elongation(EL)revealed a λ-like trend of the alloys,and Mg-7Zn-1Cu alloy exhibits the optimum tensile properties with the UTS of 258.9 MPa,YS of 126.2 MPa,and the EL of 14.2%.

关 键 词：Mg-Zn-Cu alloy Microstructure evolution Mechanical properties Thermodynamic calculation 

分 类 号：TG146.22[一般工业技术—材料科学与工程]