摘要
镁合金的轻量化优势使其有广阔的应用前景,然而普通镁合金低强度限制了它的应用。镁稀土合金拥有良好的力学性能,在Mg-GdNd-Zr合金的基础上,添加不同量的Ca元素,通过光学显微镜、X射线衍射仪、扫描电子显微镜、透射电子显微镜和拉伸性能测试等方法,对Mg-9Gd-2Nd-x Ca-0.5Zr (x=0,0.5,1.0,1.5(%,质量分数))合金热处理前后的组织和性能的变化进行了探究。结果表明:合金组织由α-Mg,Mg_5Gd相和Mg_(41)Nd_5相组织,添加Ca元素后,组织中形成了Mg_(2)Ca相。铸态合金经过热处理后,晶界上的第二相大部分溶入基体,时效态组织中析出了大量细小的板条状析出相,使合金的力学性能得到提高。时效态Mg-9Gd-2Nd-1Ca-0.5Zr合金有最高的抗拉强度,达到了256 MPa。
The low density of magnesium alloy makes it have a broad application prospect,but the low strength of the common magnesium alloy limits its application.Magnesium-rare earth alloy has satisfactory mechanical properties,adding different amounts of Ca element into Mg-Gd-Nd-Zr alloy,the effect of Ca on microstructure and properties of Mg-9Gd-2Nd-xCa-0.5Zr(x=0,0.5,1.0,1.5(%,mass fraction))alloy was investigated by an optical microscope,X-ray diffraction,a scanning electron microscope,a transmission electron microscope and tensile test.The results show that the microstructure of cast alloy is composed ofα-Mg,Mg5Gd and Mg41Nd5 phases.Mg_(2)Ca phase is formed after the addition of Ca element.After heat treatment of cast alloy,most of the second phases on the grain boundary dissolve into matrix.Amounts of fine lath precipitates are precipitated in the microstructure of aged alloy,which improves the mechanical properties of the alloy.The aged Mg-9Gd-2Nd-1Ca-0.5Zr alloy has the highest tensile strength of 256 MPa.
作者
刘建鑫
陈君
陈晓亚
孙瑞雪
李全安
张子延
Liu Jianxin;Chen Jun;Chen Xiaoya;Sun Ruixue;Li Quanan;Zhang Ziyan(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Nonferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2023年第6期1140-1149,I0004,共11页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51571087)
中原英才计划—中原青年拔尖人才项目(豫组通[2021]44号)
河南省自然科学基金项目(222300420435)资助。
