【摘要】 以新型钛锆基合金Ti-47Zr-5Al-3V（以下称47Zr）为研究对象，研究了不同温度（650℃、700℃、750℃、800℃、850℃）低压真空渗氮对合金的摩擦学性能的影响。使用扫描电子显微镜（SEM）和X射线衍射仪（XRD）、显微维氏硬度计及UMT-2摩擦磨损试验机对低压真空渗氮后合金的组织、物相、硬度及摩擦磨损性能进行分析和测试。结果表明，低压真空渗氮后，47Zr合金表面物相以Ti₂N、ZrN化合物为主，硬度最高可达710HV_0.05,表面平均硬度与基体相比提升近285HV_0.05,渗氮影响层的深度随着温度的升高而增加。不同温度低压真空渗氮47Zr合金中，耐磨性较好的为经750℃和800℃渗氮的样品。相较于原始样品，750℃低压真空渗氮后，样品的平均摩擦系数减小57.14%,磨损率在固定载荷（30 N）下降低29.74%;800℃低压真空渗氮后，样品的平均摩擦系数减小了45.71%,磨损率下降了33.74%。合金的磨损特征表明不同温度低压真空渗氮的47Zr合金在室温干摩擦条件下的磨损机制均为磨粒磨损和粘着磨损。更多还原

【Abstract】 Novel TiZr-based alloy Ti-47 Zr-5 Al-3 V（referred to as 47 Zr） was studied to reveal the effect of low-pressure vacuum nitriding at different temperatures（650 ℃, 700 ℃, 750 ℃, 800 ℃ and 850 ℃） on its tribological properties. Microstructure, phase composition, hardness and tribological properties of 47 Zr alloy with low-pressure vacuum nitriding were analyzed and tested by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, micro-Vickers and UMT-2 multifunctional tribometer. The results indicate that the surface phase composition of nitriding 47 Zr alloy is dominated by Ti₂N and ZrN compounds, and its hardness is high up to 710 HV_0.05. Compared with the substrate, the average hardness of the surface increases by nearly 285 HV_0.05. The depth of nitrided layer increases with nitriding temperature rising. Compared with the untreated samples, the average coefficient of friction（COF） decreases by 57.14% through low-pressure vacuum nitriding at 750 ℃, and the wear rate decreases by 29.74% under a normal load of 30 N. Through nitriding at 800 ℃, the average COF and wear rate decrease by 45.71% and 33.74%, respectively. The wear characteristics show that the wear mechanism of the low-pressure vacuum nitrided 47 Zr alloy at different temperature is abrasive wear and adhesive wear under dry sliding condition.更多还原