Microstructures,mechanical properties and degradability of Mg-2Gd-0.5(Cu/Ni)alloys:A comparison study  

作　　者：Shiyu Zhong Dingfei Zhang Yongqin Wang Sensen Chai Jingkai Feng Yulun Luo Jianrong Hua Qimin Dai Guangshan Hu Junyao Xu Bin Jiang Fusheng Pan 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [3]School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China [4]College of Information Science and Engineering,Jiaxing University,Jiaxing 314001,China [5]Chongqing Academy of Science and Technology,Chongqing 401123,China

出　　处：《Journal of Materials Science & Technology》2022年第33期44-58,共15页材料科学技术（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2019YFC1520303);the Scientific and Technological Research Program of Chongqing Municipal Education Commission(No.KJQN202001527);the Natural Science Foundation of Zhejiang Province(No.LQ18E010003)。

摘　　要：Low alloying Mg-2 Gd-0.5(Cu/Ni)alloys for sealing tools in the oil and gas industry were prepared.The differences in the effects of minor Cu and Ni additions on microstructures and properties of the Mg-2 Gd alloy were compared.The results showed that adding Ni was more effective than adding Cu in refining grain sizes,strengthening the basal fiber texture,and promoting the formation of LPSO phases,resulting in higher strength.The tensile yield strength/elongation of the Mg-2 Gd-0.5 Cu alloy,Mg-2 Gd-0.25 Cu-0.25 Ni alloy,and Mg-2 Gd-0.5 Ni alloy was 146 MPa/23.7%,175 MPa/23.1%,and 248 MPa/18.2%,respectively.The decreased elongation was attributed to the basal fiber texture and the presence of coarse LPSO phases.In terms of the corrosion rate in 3.5 wt.%NaCl solution,it rose from 112 mm y^(-1)for the Mg-2 Gd-0.5 Cu alloy to 269 mm y^(-1)for the Mg-2 Gd-0.25 Cu-0.25 Ni alloy and 490 mm y^(-1)for the Mg-2 Gd-0.5 Ni alloy,indicating that the addition of Ni instead of Cu showed a more significant promoting effect on the degradability of Mg alloys,which was related to more refined grains,the stronger basal fiber texture,and a larger amount of LPSO phases.

关 键 词：Magnesium alloy ALLOYING LPSO phases Mechanical properties Corrosion 

分 类 号：TG146.22[一般工业技术—材料科学与工程]