ISSN   1004-0595

CN  62-1095/O4

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郭志明, 张爱军, 韩杰胜, 孟军虎. Si掺杂对NbTaWMo难熔高熵合金的高温摩擦学性能的影响[J]. 摩擦学学报, 2021, 41(2): 197-205. DOI: 10.16078/j.tribology.2020118
引用本文: 郭志明, 张爱军, 韩杰胜, 孟军虎. Si掺杂对NbTaWMo难熔高熵合金的高温摩擦学性能的影响[J]. 摩擦学学报, 2021, 41(2): 197-205. DOI: 10.16078/j.tribology.2020118
GUO Zhiming, ZHANG Aijun, HAN Jiesheng, MENG Junhu. Effect of Si Addition on Tribological Properties of NbTaWMo Refractory High Entropy Alloy at High Temperature[J]. TRIBOLOGY, 2021, 41(2): 197-205. DOI: 10.16078/j.tribology.2020118
Citation: GUO Zhiming, ZHANG Aijun, HAN Jiesheng, MENG Junhu. Effect of Si Addition on Tribological Properties of NbTaWMo Refractory High Entropy Alloy at High Temperature[J]. TRIBOLOGY, 2021, 41(2): 197-205. 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

Effect of Si Addition on Tribological Properties of NbTaWMo Refractory High Entropy Alloy at High Temperature

  • 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NbTaWMoSi0.25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NbTaWMoSi0.25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. NbTaWMoSi0.25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. NbTaWMoSi0.25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.

     

    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 NbTaWMoSi0.25 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 NbTaWMoSi0.25 alloys were comparable. However, the wear rates decreased significantly as Si was added in NbTaWMo high entropy alloy. The wear mechanism of NbTaWMoSi0.25 alloys was abrasive wear at low and medium temperatures. At high temperatures, the main wear mechanisms were abrasive wear and oxidation wear. NbTaWMoSi0.25 refractory high entropy alloy had excellent wear resistance at a wide range temperatures. Therefore, NbTaWMoSi0.25 refractory high entropy alloy had great potential for tribological applications at high temperature.

     

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