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. 

Effect of Current Strength on Bending Fatigue Damage Characteristics of Copper-Magnesium Alloy

Under different current intensity conditions, the evolution of bending fretting fatigue damage of copper-magnesium alloy was studied. The infrared thermograph imager was used to map the temperature distribution of the micro-motion contact zone under current conditions. The surface morphology and chemical behavior of the sample contact damage area were analyzed in detail according to a series of microscopic analysis equipment, scanning, e.g. three-dimensional morphomete, scanning electron microscope, electron microprobe, X-ray photoelectron spectroscopy. Under the same number of cycles, with the increase of current intensity, the bending fretting fatigue life gradually decreased, the temperature of the contact zone gradually increased, the size of the contact damage zone increased, the spalling layer gradually refined, and the degree of oxidation in the contact damage zone increased. The main components of oxidized wear debris were CuO and Cu₂O. The main damage mechanisms were oxidative wear, adhesive wear and spalling.