Study on Microstructure and Properties of Mg-Sr-Ag-La Alloys with Different Compositions
Author of the article:XU Chunjie;YE Keke;ZHAO Ruifang;ZHANG Kaijun;HUANG Anzhuo;LI Jie;LIN Shunsheng;GUO Yuyong;LIANG Xinh
Author's Workplace：School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;Institute of Medicine and Health,Guangdong Academy of Sciences,Guangzhou 510500,China;Xi'an Shechtman Nobel Prize New Materials Institute,Xi'an 710048,China;National Engineering Researching Center for Healthcare Devices,Guangzhou 510500,China;Guangdong Key Lab Medical Electronic Instruments and Polymer Material Products,Guangzhou 510500,China
Key Words：magnesium alloy extrusion deformation microstructure and mechanical properties
Abstract：The effects of alloy composition on the microstructure and properties of Mg-Sr-Ag-La alloys and evolution rule were investigated.The results show that the microstructure of as-cast Mg-Sr-Ag-La alloy is characterized by typical grey-whiteα-Mg matrix dendrite and the irregular shape of the second phase,including Mg17Sr2,Mg17La2 and AgMg4,which are distributed in the grain boundary and dendrite interstice.The as-cast and as-extruded Mg-4 Sr-2 Ag-6 La alloys have the highest hardness of 83.9 HV5 and 106.7 HV5,respectively.The strength index of Mg-Sr-Ag-La alloy extruded bar can reach the property index of human bone.With the increase of La content,the tensile strength of Mg-4 Sr-2 Ag-6 La alloy is the highest,up to 344.5 MPa.For Mg-Sr-Ag-La alloys,the corrosion resistance of Mg matrix can be enhanced by adding appropriate alloying elements.The self-corrosion potential of Mg-4 Sr-2 Ag-6 La alloy is the highest,the self-corrosion potential of Mg-4 Sr-4 Ag-2 La alloy is higher,the current density is lower and the corrosion rate is lower.
