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℃.
作者
李娜
徐流杰
窦彩虹
魏世忠
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)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
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。
关键词
固液法
Y2O3掺杂
钼合金
高温拉伸
solid-liquid method
Y2O3-doped
molybdenum alloy
high temperature tensile
