合金元素Ce对Mg-Y-Zr稀土镁合金显微组织和力学性能的影响  

Microstructures and Mechanical Properties of Mg-Y-Zr Ignition Resistance Alloy with Adding Rare Earth Ce

作　　者：王文礼[1,2] 雷宁宁 邱玉龙 贾京达 闫新 Wang Wenli;Lei Ningning;Qiu Yulong;Jia Jingda;Yah Xin(College of Metallurgical Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, China;Metallurgical Engineering Technology Research Center of Shaanxi Province, Xi＇an 710055, China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西省冶金工程技术研究中心,陕西西安710055

出　　处：《稀有金属》2018年第4期438-442,共5页Chinese Journal of Rare Metals

基　　金：陕西省科技新星项目(2012KJXX-33)资助

摘　　要：镁合金是最轻的商用金属结构材料,大多为密排六方体结构,常温下难以产生变形,较低的塑性极大地限制了镁合金的应用。提高镁合金的变形温度可以激活镁合金的棱柱面滑移系和锥面滑移系,进而提升镁合金的塑性,使其产生大变形,降低生产成本,拓宽应用范围。但是,镁合金在高温下极易燃烧并发生氧化,现有的阻燃系镁合金力学性能并不理想。为了增加镁合金的应用范围,提高镁合金的变形温度,就要改善阻燃系镁合金的力学性能。为了研究出拥有良好力学性能的阻燃镁合金,本文选择Mg-3Y-0.6Zr基础合金,通过添加不同含量的Ce元素,熔炼Mg-3Y-x Ce-0.6Zr（x=0,0.7,1.5,2.0,3.0,4.5）合金,并且通过对其进行金相（OM）组织观察,力学性能测试,能谱（EDS）测试以及扫描电镜（SEM）分析研究了合金的显微组织、力学性能、元素分布及断口形貌。研究表明,在Mg-3Y-0.6Zr合金中适量加入Ce元素能够细化合金的显微组织,提升合金力学性能。与其他待测合金相比,Mg-3Y-1.5Ce-0.6Zr合金的综合力学性能最佳,其延伸率为21%,抗拉强度为184.71 MPa。Magnesium alloy is the lightest commercial metal structure material.Most of the alloys are hexagonal close-packed structure and can hardly deform in room temperature.The application of magnesium alloy is limited greatly by the low plasticity.The prismatic slip system and cone slip system of magnesium can be activated by raising the deformation temperature,then the plasticity is improved and large deformation occurs to reduce the cost of production and broaden the application.However,magnesium alloy is prone to burn and oxidize at high temperature,and the mechanical property of ignition resistance magnesium alloy is poor.Thus it is necessary to raise deformation temperature and improve the mechanical property of ignition resistance magnesium alloy in order to enlarge the application range.To get a kind of magnesium alloy owning good mechanical properties and large deformation,different contents of element Ce were added to Mg-3Y-0.6Zr basic magnesium alloy and the Mg-3Y-xCe-0.6Zr（x = 0,0.7,1.5,2.0,3.0,4.5）alloys were smelted to study the microstructure,mechanical properties,element distribution and fracture morphology of alloys by optical microscopy（OM）,tensile test,energy dispersive spectroscopy（EDS） and scanning electron microscopy（SEM）.The study showed that the addition of Ce in Mg-3Y-0.6Zr alloy could refine the microstructure and improve the mechanical properties of the alloy.Mg-3Y-1.5Ce-0.6Zr alloy had best properties with elongation of 21% and tensile strength of 184.71 MPa,compared with other alloys.

关 键 词：镁合金 稀土元素 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]