ABSTRACT CoCrNi, CoCrW and CoCrMo alloys were fabricated by powder metallurgy technology. The effect of nickel, tungsten and molybdenum, as alloying elements, on the microstructure, phase, mechanical and high-temperature tribological properties of CoCr matrix alloys were systematically studied. The wear and friction behaviors were investigated from room temperature (23 °C) to 1000 °C. The alloys were found to contain different ratios of γ(fcc) and ε(hcp) phases; Ni stabilized γ(fcc), while W and Mo stabilized ε(hcp). The hardness measurements showed that the strengthening effect increased with the addition of Ni, W, and Mo, respectively. Addition of Mo and W resulted in the lowest and highest friction coefficients with the addition of Ni resulting in a friction coefficient between the two. The wear and friction behaviors of the three alloys depended on the phase, alloying elements and oxidation from room temperature to 1000 °C. Coefficients of friction of the alloys were not directly correlated with the wear rates. CoCr matrix alloys reinforced with Mo showed the highest hardness and the best high-temperature tribological performance. It was attributed to the high hardness, stable oxide film, and in situ formed high-temperature solid lubricants. With an increase in temperature, the wear mechanism was found to change from abrasive wear to oxidative wear.

中文翻译：

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Ni、W和Mo对CoCr基合金组织、相和高温滑动磨损性能的影响

摘要 CoCrNi、CoCrW 和 CoCrMo 合金是通过粉末冶金技术制备的。系统研究了镍、钨和钼作为合金元素对钴铬基合金组织、相、力学性能和高温摩擦学性能的影响。研究了从室温 (23 °C) 到 1000 °C 的磨损和摩擦行为。发现合金含有不同比例的 γ(fcc) 和 ε(hcp) 相；Ni稳定了γ(fcc)，而W和M​​o稳定了ε(hcp)。硬度测量表明，强化效果分别随着 Ni、W 和 Mo 的加入而增加。添加 Mo 和 W 导致最低和最高摩擦系数，添加 Ni 导致两者之间的摩擦系数。三种合金的磨损和摩擦行为取决于相、合金元素和从室温到 1000 °C 的氧化。合金的摩擦系数与磨损率没有直接关系。钼增强的钴铬基合金表现出最高的硬度和最好的高温摩擦学性能。这归因于高硬度、稳定的氧化膜和原位形成的高温固体润滑剂。随着温度的升高，磨损机制被发现从磨料磨损转变为氧化磨损。钼增强的钴铬基合金表现出最高的硬度和最好的高温摩擦学性能。这归因于高硬度、稳定的氧化膜和原位形成的高温固体润滑剂。随着温度的升高，磨损机制被发现从磨料磨损转变为氧化磨损。钼增强的钴铬基合金表现出最高的硬度和最好的高温摩擦学性能。这归因于高硬度、稳定的氧化膜和原位形成的高温固体润滑剂。随着温度的升高，磨损机制被发现从磨料磨损转变为氧化磨损。