Er对铸态Mg-8Gd-2Nd-0.5Zr合金组织和力学性能的影响  

Effect of Er on microstructure and mechanical properties of as-cast Mg-8Gd-2Nd-0.5Zr alloy

作　　者：马一丹 李全安[1,2,3] 陈晓亚 李卓琳[1] MA Yi-dan;LI Quan-an;CHEN Xiao-ya;LI Zhuo-lin(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 Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China;Longmen Laboratory,Luoyang 471000,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属新材料与先进加工技术省部共建协同创新中心,河南洛阳471023 [3]龙门实验室,河南洛阳471000

出　　处：《材料热处理学报》2025年第1期22-29,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52371108,52201119);龙门实验室前沿探索课题(LMQYTSKT014)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)、能谱仪(EDS)和电子拉伸试验机等研究了添加不同的Er(0、1、3和5 mass%)含量对铸态Mg-8Gd-2Nd-0.5Zr合金组织与力学性能的影响。结果表明:Er元素的加入可以代替Gd原子的位置,形成Mg_(5)(Gd,Er)相,细化合金的晶粒。除此之外,Er元素溶入基体中可以改变合金的晶格常数,使晶轴比c/a减小,影响合金的强度和塑性。当Er的添加量为3 mass%时,合金的晶粒尺寸最小,约为32μm,抗拉强度和伸长率最大,分别为230 MPa和8.1%,较未添加Er的合金分别提高了32.9%和88.3%。合金的室温拉伸断口随着Er含量的增加,解理面减少,撕裂棱变多,但总体仍表现为脆性断裂。Effect of adding different Er(0,1,3 and 5 mass%)contents on microstructure and mechanical properties of as-cast Mg-8Gd-2Nd-0.5Zr alloy was studied by means of optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS)analysis and electronic tensile testing machine.The results show that the addition of Er element can replace the position of Gd atoms,form Mg_(5)(Gd,Er)phase,and refine the grain size of the alloy.In addition,the dissolution of Er elements into the matrix can change the lattice constant of the alloy,reduce the crystal axis ratio c/a,and affect the strength and plasticity of the alloy.When the addition amount of Er is 3 mass%,the grain size of the alloy is the smallest,about 32μm,the tensile strength and elongation are the highest,which are 230 MPa and 8.1%,respectively,which are 32.9%and 88.3%higher than the alloy without the addition of Er.With the increase of Er content,the room temperature tensile fracture of the alloys shows a decrease in cleavage planes and an increase in tearing edges,but overall their still exhibits brittle fracture.

关 键 词：Mg-8Gd-2Nd-0.5Zr合金 ER 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]