氧化钇掺杂对钼合金高温力学性能的影响  

High Temperature Mechanical Properties of Molybdenum Alloys Doped Yttrium Oxide

作　　者：李娜[1] 徐流杰[2] 窦彩虹[1] 魏世忠[2,3] Li Na;Xu Liujie;Dou Caihong;Wei Shizhong(School of Materials Science and Engineering y Henan University of Science and Technology,Luoyang 471000,China;Henan Key Laboratory of High Temperature Structural and Functional Materials,Henan University of Science and Technology,Luoyang 471000,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,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471000 [2]河南科技大学河南高温结构与功能材料重点实验室,河南洛阳471000 [3]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,河南洛阳471000

出　　处：《稀有金属》2020年第6期578-584,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(U1704152);长江学者和创新团队发展计划项目(IRT1234)资助。

摘　　要：通过固液掺杂法制备了5种不同含量的氧化钇掺杂钼合金粉体,经压结、烧结、轧制后制备成钼合金板材。利用X射线衍射(XRD)分析了钼合金的相组成,用能谱(EDS)表征了钼合金的化学成分,用热-力学物理模拟试验机对钼合金板材在1000~1400℃的高温拉伸性能进行了测试,用维氏显微硬度仪测定了钼合金室温及经高温拉伸后的硬度,用扫描电子显微镜(SEM)观察了钼合金的显微组织和断口形貌。结果表明:钇以氧化钇的形式存在于钼合金中,使其晶粒细化且大小均匀。氧化钇掺杂量对钼合金板材的高温抗拉强度、高温延伸率和高温拉伸后显微硬度有显著的影响。随着氧化钇掺杂量的增多,钼合金的显微硬度逐渐增加。掺杂氧化钇提高了钼合金板材的高温强度、高温延伸率和高温拉伸后的显微硬度,并随着氧化钇掺杂量的增加而增加。当氧化钇的掺杂量为0.5%(质量分数)时,钼合金板的高温综合性能最好,1000℃时的高温抗拉强度达到428 MPa,延伸率达到12.7%,拉伸后显微硬度达到HV200252.8。Five kinds of Y2O3 doped Mo alloy powders with different contents were prepared by solid-liquid doping method.Then Mo alloy plates were prepared after compaction,sintering and rolling.The phase structures,chemical components,high temperature tensile properties,micro-hardness,microstructures and fracture morphologies of Mo alloys were tested by X-ray diffraction(XRD),energy dispersive spectrometer(EDS),thermal-mechanical physical simulation test apparatus,Vickers micro-hardness tester,and scanning electron microscope(SEM),respectively.The results indicated that yttrium existed in Mo alloy in the form of Y2O3,which made the grain size fine and uniform.Y2O3 doping had a significant effect on the tensile strength,elongation and micro-hardness of Mo alloy plate after high temperature tensile.Moreover,the micro-hardness of Mo alloys increased gradually with the increase of Y2O3 doping,and the high temperature tensile strength,elongation,and micro-hardness of Mo alloys after high temperature tensile were improved,and increased gradually with the increase of Y2O3 doping.In addition,when the amount of Y2O3 was 0.5%(mass fraction),the high temperature comprehensive performance of the Mo alloy plate was the best,with high temperature tensile strength of 428 MPa,elongation of 12.7%,and micro-hardness of HV200252.8 at 1000℃.

关 键 词：固液法 Y2O3掺杂 钼合金 高温拉伸 

分 类 号：TB333[一般工业技术—材料科学与工程]