电流作用对铜镁合金弯曲微动疲劳损伤特性的影响

采用自主研制的试验装置，研究了铜镁合金在不同电流强度条件下的弯曲微动疲劳损伤演变规律. 运用红外线热成像仪测试电流条件下微动接触区温度分布情况；利用白光干涉仪、扫描电镜、电子探针、X射线光电子能谱仪对试样接触损伤区的微观形貌和化学行为进行分析. 试验结果表明：在相同循环次数下，随着电流强度的增加，铜镁合金弯曲微动疲劳寿命逐渐降低，接触区温度逐渐上升，接触损伤区尺寸增大，剥落层逐渐细化，接触损伤区氧化程度越来越严重，氧化磨屑的主要成分为CuO和Cu2O；主要损伤机制为氧化磨损、黏着磨损和剥落.

A self-developed experimental setup was employed to investigate the evolution law of bending fretting fatigue damage of copper-magnesium alloy under different current intensities. The temperature distribution in the fretting contact zone under current conditions was measured using an infrared thermal imager; the microscopic morphology and chemical behavior of the contact damage zone of the specimens were analyzed using a white light interferometer, scanning electron microscope (SEM), electron probe microanalyzer (EPMA), and X-ray photoelectron spectroscopy (XPS). The experimental results show that under the same number of cycles, with the increase of current intensity, the bending fretting fatigue life of copper-magnesium alloy gradually decreases, the temperature of the contact zone gradually rises, the size of the contact damage zone increases, the spalled layer gradually refines, the oxidation degree of the contact damage zone becomes increasingly severe, and the main components of the oxidized wear debris are CuO and Cu₂O; the main damage mechanisms are oxidative wear, adhesive wear and spalling.