摘要
对比研究了合金成分对Mg-Sr-Ag-La合金组织和性能的影响及演化规律。结果表明,Mg-Sr-Ag-La合金铸态组织为典型的灰白色α-Mg基体枝晶及分布在晶界和枝晶间隙中的条状、颗粒状和小块状等形状不规则的第二相组成,包括Mg_(17)Sr_(2)和Mg_(17)La_(2)以及AgMg_(4)。铸态和挤压态Mg-4Sr-2Ag-6La合金的硬度均最高,分别为83.9 HV5和106.7 HV5。Mg-Sr-Ag-La合金挤压棒材的强度指标均能达到人骨的性能指标。La元素含量的提高,有利于拉伸性能的提高,Mg-4Sr-2Ag-6La合金的抗拉强度最大,达到344.5 MPa。对于Mg-Sr-Ag-La合金而言,适量合金元素的加入能够增强镁基体的抗蚀性。Mg-4Sr-2Ag-6La合金自腐蚀电位最高,Mg-4Sr-4Ag-2La合金拥有较大的自腐蚀电位、较小的电流密度以及较低的腐蚀速率。
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 Mg_(17)Sr_(2),Mg_(17)La_(2) 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.
作者
徐春杰
叶柯柯
赵瑞芳
张凯军
黄安卓
李杰
林舜生
郭昱雍
梁欣航
张忠明
XU Chunjie;YE Keke;ZHAO Ruifang;ZHANG Kaijun;HUANG Anzhuo;LI Jie;LIN Shunsheng;GUO Yuyong;LIANG Xinhang;ZHANG Zhongming(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)
出处
《铸造技术》
CAS
2021年第7期560-564,共5页
Foundry Technology
基金
陕西省高等学校学科创新引智基地项目(S2021-ZC-GXYZ-0011)
广东省科学院建设国内一流研究机构行动专项资金项目(2019GDASYL-0103017)
广东省医用电子仪器及高分子材料制品重点实验室(广东省医疗器械研究所)开放课题(GDNERC-KF2020001)
西安市高校重大科技创新平台及科技成果就地转化项目(20GXSF0003)
2020国家级大学生创新创业训练计划(G202010700029)
关键词
镁合金
挤压变形
组织与性能
magnesium alloy
extrusion deformation
microstructure and mechanical properties
