Abstract
Low alloying Mg-2Gd-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-2Gd alloy were compared.The results showed that adding Ni was more effective than adding Cu in re-fining 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-2Gd-0.5Cu alloy,Mg-2Gd-0.25Cu-0.25Ni alloy,and Mg-2Gd-0.5Ni alloy was 146 MPa/23.7％,175 MPa/23.1％,and 248 MPa/18.2％,re-spectively.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-2Gd-0.5Cu alloy to 269 mm y-1 for the Mg-2Gd-0.25Cu-0.25Ni alloy and 490 mm y1 for the Mg-2Gd-0.5Ni 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.
基金项目
国家重点研发计划(2019YFC1520303)
Scientific And Technological Research Program Of Chongqing Municipal Education Commission(KJQN202001527)
浙江省自然科学基金(LQ18E010003)
access to the facilities of the Electron Microscopy Center of Chongqing University and the Analytical and Testing Center of ()
NETL
NSTL
维普
万方数据