Si掺杂对NbTaWMo难熔高熵合金的高温摩擦学性能的影响

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.

A NbTaWMoSi0.25 refractory high-entropy alloy was successfully prepared via spark plasma sintering by doping silicon into the NbTaWMo refractory high-entropy alloy. The variations in phase composition, microstructure and mechanical properties were systematically investigated, with a special focus on the comparative analysis of tribological properties within the temperature range of 25 °C to 800 °C. The results demonstrate that the pristine NbTaWMo high-entropy alloy consists of a single BCC phase, whereas the NbTaWMoSi0.25 alloy is composed of two phases: the BCC phase and a silicide phase. After silicon doping, the room-temperature yield strength, compressive strength and fracture strain of the NbTaWMo refractory high-entropy alloy are notably enhanced. For the Si-doped NbTaWMo refractory high-entropy alloy, the coefficient of friction exhibits only minor fluctuations from 25 °C to 800 °C, while its wear resistance is significantly improved. This enhancement in wear resistance is mainly attributed to the silicide phase strengthening the alloy's mechanical strength. The wear mechanism of the NbTaWMoSi0.25 refractory high-entropy alloy from room temperature to intermediate temperatures is primarily abrasive wear, whereas at high temperature stages, the wear mechanism is dominated by the combined effects of abrasive wear and oxidative wear. The NbTaWMoSi0.25 high-entropy alloy exhibits excellent wear resistance across a wide temperature range, demonstrating great application potential in the field of high-temperature tribology.

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背景概述

该数据集研究了Si掺杂对NbTaWMo难熔高熵合金高温摩擦学性能的影响，发现Si掺杂显著提高了合金的力学性能和耐磨性，并在不同温度下表现出不同的磨损机制。数据集提供了详细的实验方法和结果分析，适用于高温摩擦学领域的研究。