微量C掺杂对TiZrNbTaMo难熔高熵合金组织性能的影响  

Effect of Trace Carbon Doping on the Microstructure and Properties of TiZrNbTaMo Refractory High-Entropy Alloys

作　　者：韩娟 周大奎 雷乃义 周圣丰 易艳良 HAN Juan;ZHOU Da-kui;LEI Nai-yi;ZHOU Sheng-feng;YI Yan-liang(Institute of Advance Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China;College of Chemistry and Materials Science,Jinan University,Guangzhou 510632,China;Shaoguan Research Institute,Jinan University,Shaoguan 512027,China)

机构地区：[1]暨南大学先进耐磨蚀及功能材料研究院,广东广州510632 [2]暨南大学化学与材料学院,广东广州510632 [3]暨南大学韶关研究院,广东韶关512027

出　　处：《稀有金属与硬质合金》2025年第2期139-152,共14页Rare Metals and Cemented Carbides

基　　金：广东省基础与应用基础研究基金项目(2024A1515012353);广州市科技计划项目(2024A04J4063)。

摘　　要：通过非自耗真空电弧熔炼炉制备(Ti_(42.5)Zr_(42.5)Nb_(10)Ta_(5))_(93)Mo_(7)难熔高熵合金锭。借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱分析仪(EDS)、电子背散射衍射仪(EBSD)、电子探针微量分析仪(EPMA)、X射线光电子能谱仪(XPS)、显微硬度计、室温拉伸试验以及高温摩擦磨损试验,系统研究了0.05%(摩尔分数)C掺杂对合金微观结构、力学性能和宽温域摩擦学性能的影响。结果表明:未掺杂和0.05%C掺杂的合金均由单一BCC相组成,微量C掺杂并未导致第二相。由于晶界偏析效应,微量C掺杂后,合金的硬度由337.3 HV_(0.2)提升到357.6 HV_(0.2),断裂强度由693 MPa增至1040 MPa,延伸率由1.11%升至25.79%。两种合金的耐磨性均随着试验温度的升高呈先下降后上升再下降的趋势;磨损机制由室温下的磨粒磨损为主转变为高温下(700℃)的氧化磨损为主。在不同试验温度下,掺杂0.05%C的合金均表现出更好的耐磨性。(Ti_(42.5)Zr_(42.5)Nb_(10)Ta_(5))_(93)Mo_(7) refractory high-entropy alloy ingots were prepared using a non-consumable vacuum arc melting furnace.A systematic study was conducted on the effects of 0.05%(mole fraction)carbon doping on the microstructure,mechanical properties and tribological properties over a wide temperature range of the alloy using X-ray diffractometer(XRD),scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),electron backscatter diffractometer(EBSD),electron probe microanalyzer(EPMA),X-ray photoelectron spectrometer(XPS),microhardness tester,room-temperature tensile testing,and high-temperature friction and wear testing.The results show that both the undoped and 0.05%C-doped alloys are composed of a single BCC phase,and trace carbon doping does not lead to the formation of a second phase.Due to the grain boundary segregation effect,trace carbon doping increases the hardness of the alloy from 337.3 HV_(0.2)to 357.6 HV_(0.2),the fracture strength from 693 MPa to 1040 MPa,and the elongation from 1.11%to 25.79%.The wear resistance of the two alloys initially decreases,then increases,and finally decreases again with the rise in test temperature.The wear mechanism transitions from predominant abrasive wear at room temperature to predominant oxidative wear at high temperature(700℃).At different test temperatures,the 0.05%C-doped alloy consistently exhibits better wear resis-tance.

关 键 词：难熔高熵合金 (Ti_(42.5)Zr_(42.5)Nb_(10)Ta_5)_(93)Mo_(7) C掺杂 微观结构 力学性能 摩擦学性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程]