Page 52 - 《摩擦学学报》2021年第2期

第 41 卷 第 2 期 摩 擦 学 学 报 Vol 41 No 2
2021 年 3 月 Tribology Mar, 2021

DOI: 10.16078/j.tribology.2020118

Si掺杂对NbTaWMo难熔高熵合金的高温

摩擦学性能的影响

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郭志明 , 张爱军 , 韩杰胜 , 孟军虎 1*
(1. 中国科学院兰州化学物理研究所 固体润滑国家重点实验室，甘肃 兰州 730000;
2. 中国科学院大学 材料与光电研究中心，北京 100049)
摘 要: 采用放电等离子烧结技术在NbTaWMo难熔高熵合金中掺杂Si元素成功制备了NbTaWMoSi 0.25 难熔高熵合
金，研究了物相组成、显微结构和力学性能的变化，并重点对比了25 ~800 ℃的摩擦学性能. 结果表明：NbTaWMo高
熵合金由单一的BCC相组成，而NbTaWMoSi 0.25 合金由BCC相和硅化物两相组成. 在NbTaWMo难熔高熵合金中掺
杂Si元素后，高熵合金室温下的屈服强度、抗压强度和断裂应变均有显著的提高. NbTaWMo难熔高熵合金掺杂Si元
素后从25 ℃到800 ℃摩擦系数变化较小，但其耐磨性显著改善，其耐磨性的提高主要由于硅化物增强了合金的强
度. NbTaWMoSi 0.25 难熔高熵合金从室温到中温阶段的磨损机制主要为磨粒磨损，而高温阶段的磨损机制主要表现
为磨粒磨损和氧化磨损的综合作用. NbTaWMoSi 0.25 高熵合金在宽温域内具有良好的耐磨性，在高温摩擦学领域具
有较大的应用潜力.
关键词: 难熔高熵合金; NbTaWMo; Si掺杂; 力学性能; 摩擦学性能
中图分类号: TG115.5 文献标志码: A 文章编号: 1004-0595(2021)02–0197–09

Effect of Si Addition on Tribological Properties of NbTaWMo

Refractory High Entropy Alloy at High Temperature

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GUO Zhiming , ZHANG Aijun , HAN Jiesheng , MENG Junhu 1*
(1. State Key Laboratory of Solid lubrication, Lanzhou Institute of Chemical Physics, Chinese
Academy of Sciences, Gansu Lanzhou 730000, China
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of
Sciences, Beijing 100049, China)
Abstract: In this study, NbTaWMo high entropy alloy with Si addition were produced by spark plasma sintering. The
phase constitutions, microstructures and mechanical properties were analyzed, and the tribological properties from 25 ℃
to 800 ℃ were investigated. NbTaWMo refractory high entropy alloys were composed of BCC phase, and
NbTaWMoSi 0.25 refractory high entropy alloys were composed of BCC and silicide phases. As Si was added in
NbTaWMo refractory high entropy alloy, the yield strength, compressive strength and fracture strain at room
temperature improved significantly. The friction coefficients of NbTaWMo and NbTaWMoSi 0.25 alloys were
comparable. However, the wear rates decreased significantly as Si was added in NbTaWMo high entropy alloy. The
wear mechanism of NbTaWMoSi 0.25 alloys was abrasive wear at low and medium temperatures. At high temperatures,
the main wear mechanisms were abrasive wear and oxidation wear. NbTaWMoSi 0.25 refractory high entropy alloy had
excellent wear resistance at a wide range temperatures. Therefore, NbTaWMoSi 0.25 refractory high entropy alloy had
great potential for tribological applications at high temperature.
Key words: refractory high entropy alloy; NbTaWMo; Si addition; mechanical properties; tribological properties

Received 10 June 2020, revised 16 August 2020, accepted 9 September 2020, available online 28 March 2021.
*Corresponding author. E-mail: jhmeng@licp.cas.cn, Tel: +86-931-4968378.