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N离子注入强化NiCoCr中熵合金的 摩擦学行为研究
Study of the Tribological Behavior of NiCoCr Medium-entropy Alloy Strengthened by N Ion Implantation
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- DOI:
- 作者:
- 朱 瑞1，翟海民1，2，李文生2，3，4
ZHURui1, ZHAI Haimin1,2, LI Wensheng2,3,4
- 作者单位:
- 1. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050；2.兰州理工大学材料与科 学工程学院，甘肃兰州730050；3.兰州资源环境职业技术大学冶金工程学院，甘肃兰州730015；4.西北师范大学物理 与电子工程学院，甘肃兰州730070
1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China; 2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 3. School of Metallurgical Enginning, Lanzhou Resources & Environment Voc-Tech University, Lanzhou 730015, China; 4. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
- 关键词:
- NiCoCr 中熵合金；N离子注入；摩擦学行为；磨损机制
NiCoCr medium-entropy alloy; N ion implantation; tribological behavior; wear mechanism
- 摘要:
- 为提升铸态等原子比NiCoCr中熵合金(MEA)的摩擦性能，采用N离子注入方法对NiCoCrMEA进行表 面强化处理，然后利用扫描电镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)技术研究了N离子注入处理对 NiCoCr MEA 耐磨擦性能的影响机理。 结果表明，氮离子注入使NiCoCrMEA表面引入CrN相进而使显微硬度显著提 升至373.1HV0.1，达铸态合金的 1.69 倍。 改性的合金耐磨性显著优于铸态，与ZrO2对磨时磨损体积降至6.79×10-2mm3。 滑动频率对摩擦学行为影响显著，摩擦系数随频率增加呈先升后降趋势，磨损率则呈反向变化规律。 此外，磨损机制呈 现频率依赖性，低频率(1Hz)下以氧化磨损与粘着磨损为主，伴随裂纹及塑性变形；而高频率(2~5Hz)下转为磨粒磨损主 导，伴随氧化磨损及轻微塑性变形。To enhance the tribological properties of an as-cast equiatomic NiCoCr medium-entropy alloy (MEA), surface modification was performed via nitrogen ion implantation. The influence mechanism of N-ion implantation on the wear resistance of NiCoCr MEAs was systematically investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results indicate that nitrogen ion implantation introduces the CrN phase into the NiCoCr MEA surface, significantly increasing its microhardness to 373.1 HV0.1 (1.69 times greater than that of the as-cast alloy). Compared with the as-cast state, the modified alloy demonstrates substantially superior wear resistance, with a reduced wear volume of 6.79×10-2 mm3 when sliding against a ZrO2 counterpart. The sliding frequency has a pronounced influence on the tribological behavior: the friction coefficient initially increases and then decreases with increasing frequency, whereas the wear rate has the opposite trend. In addition, wear mechanisms exhibit frequency dependence: at low frequencies (1 Hz), oxidative wear and adhesive wear dominate, accompanied by cracking and plastic deformation; at higher frequencies (2~5 Hz), abrasive wear prevails alongside oxidative wear and minor plastic deformation.