Effect of Ag on High-Temperature Oxidation Behavior of Mg-6.5Gd-5.6Y-0.1Nd-0.01Ce-0.4Zr Alloy  

作　　者：Shuang Guo Tianyu Liu Tianjiao Luo Yingju Li Xiaohui Feng Qiuyan Huang Ce Zheng Cheng Zhu Yuansheng Yang Weirong Li Feng Li 

机构地区：[1]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang,110870,China [2]Institute of Metal Research,Chinese Academy of Science,Shenyang,110016,China [3]School of Materials Science and Engineering,University of Science and Technology of China,Hefei,230026,China [4]Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250014,China [5]Dongguan EONTEC Co.Ltd,Guangdong,523662,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第11期1843-1857,共15页金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB3701100);the National Key Research and Development Program of China(No.2016YFB0301105);the Applied Basic Research Program Project of Liaoning Province of China(No.2023020253-JH2/1016);the Key Research and Development Plan of Shanxi Province(No.202102050201005);the Dongguan Innovative Research Team Program(No.2020607134012).

摘　　要：In this paper,the isothermal oxidation experiments were used to study the effect of Ag on the high-temperature oxidation behavior of Mg-6.5Gd-5.6Y-0.1Nd-0.01Ce-0.4Zr(wt%)alloy oxidized at 350℃,400℃ and 450℃ for 120 h.The results show that the oxidation weight gain of the alloy mainly occurs in the early oxidation stage(0-20 h).This reason attributes to the lack of protective oxide film and the rapid inward diffusion of oxygen through the macroscopic defects of the incomplete oxide film.When dense oxide films such as Y_(2)O_(3),Gd_(2)O_(3),and ZrO2 form,they hinder the inward transport of oxygen ions and improve the high-temperature oxidation resistance of the alloy.In addition,the role of the Ag element at three temperatures is different.The addition of Ag mainly promotes the formation of eutectic phases such as Mg3Gd,Mg24Y5,and Ag2Gd,which reduces the content of Gd and Y elements in the alloy matrix,resulting in a decrease in the diffusion rate of Gd and Y elements during the oxidation process at 350℃ and 400℃,and weakens the oxidation resistance of Ag-containing alloys.However,in the oxidation experiment at 450℃,a large amount of eutectic phase is solid dissolved into the matrix,reducing the difference in element content.At this time,it is detected that the Ag element promoted the outward diffusion of Gd and Y elements,accelerating the formation of the oxide film.The oxidation resistance of Ag-containing alloys is improved.

关 键 词：Magnesium alloy High-temperature oxidation Thermogravimetric analysis Gibbs free energy Oxide film Oxidation resistance 

分 类 号：TG146.23[一般工业技术—材料科学与工程]