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合金成分对Mg-Sr-Ag-La合金组织与性能影响研究
Study on Microstructure and Properties of Mg-Sr-Ag-La Alloys with Different Compositions
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- DOI:
- 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 Xinh
- 作者单位:
- 西安理工大学材料科学与工程学院 广东省科学院健康医学研究所 西安谢赫特曼诺奖新材料研究院 国家医疗保健器具工程技术研究中心 广东省医用电子仪器及高分子材料制品重点实验室
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
- 关键词:
- 镁合金 挤压变形 组织与性能
magnesium alloy extrusion deformation microstructure and mechanical properties
- 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Mg17Sr2和Mg17La2以及AgMg4。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 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.