微量Y_(2)O_(3)对多孔Mg-Al合金组织和性能的影响  

Effect of Trace Yttrium Oxide on the Microstructure and Properties of Porous Mg-Al Alloy

作　　者：雷德山 肖晓华 方梓伊 邓睿 刘千礼 黄本生[1] LEI De-shan;XIAO Xiao-hua;FANG Zi-yi;DENG Rui;LIU Qian-li;HUANG Ben-sheng(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Network and Information center,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]西南石油大学网络与信息化中心,四川成都610500

出　　处：《材料保护》2023年第4期81-87,共7页Materials Protection

基　　金：国家级大学生创新创业训练计划(S202110615015);西南石油大学大学生课外开放实验项目(2020KSZ61003)资助。

摘　　要：镁基多孔材料在生物医用领域具有广阔的应用前景,为提高多孔Mg-Al合金在人体体液中的耐腐蚀性,采用粉末冶金法制备多孔Mg-Al合金,添加不同含量(0,0.2%,0.4%,0.6%)的Y_(2)O_(3)对Mg-Al合金进行改性。采用金相显微镜、XRD、SEM、万能试验机和电化学工作站探究了Y_(2)O_(3)含量对多孔Mg-Al合金的孔隙率和孔隙形貌、显微组织、抗压强度及其在Hank’s仿生溶液中耐蚀性的影响。结果表明:采用粉末冶金法制备的多孔Mg-Al合金的孔隙率为39%左右,粉末冶金法可较为准确地控制多孔Mg-Al合金的孔隙形貌和大小。多孔Mg-Al合金主要由Mg和第二相Al12Mg17组成,Y_(2)O_(3)的添加可使多孔Mg-Al合金晶粒得到细化、晶粒尺寸均匀化,第二相分布更加均匀,并提高多孔Mg-Al合金的抗压强度及其在Hank’s仿生溶液中的耐蚀性。当Y_(2)O_(3)含量为0.4%时,多孔Mg-Al合金的抗压强度为46.4 MPa,在Hank’s仿生溶液中的腐蚀速率为0.88744 mm/a。Mg-based porous materials have broad application prospect in biomedical field.In order to improve the corrosion resistance of porous Mg-Al alloy in human body fluid,porous Mg-Al alloy was prepared by powder metallurgy,and Y_(2)O_(3)with different contents(0,0.2%,0.4%,0.6%)was added to modify the Mg-Al alloy.The effects of Y2 O3 content on the porosity,pore morphology,microstructure,compressive strength and corrosion resistance of porous Mg-Al alloy in Hank's biomimetic solution were investigated by means of metallographic microscope,XRD,SEM,universal testing machine and electrochemical workstation.Results showed that the porosity of porous Mg-Al alloy prepared by powder metallurgy was about 39%,and the powder metallurgy method could accurately control the pore morphology and size of porous Mg-Al alloy.Moreover,porous Mg-Al alloy was mainly composed of Mg and the second phase Al_(12)Mg17.The addition of Y_(2)O_(3)could refine the grains of porous Mg-Al alloy,homogenize the grain size,distribute the second phase more evenly,and improve the compressive strength of porous Mg-Al alloy and its corrosion resistance in Hank's bionic solution.When the content of Y_(2)O_(3)was 0.4%,the compressive strength of porous Mg-Al alloy was 46.4 MPa,and the corrosion rate in Hank's biomimetic solution was 0.88744 mm/a.

关 键 词：多孔Mg-Al合金 Y_(2)O_(3) 抗压强度 耐蚀性 Hank’s仿生溶液 

分 类 号：TG174[金属学及工艺—金属表面处理]