(西南交通大学 机械工程学院，成都 610031)
摘 要: 本文开展了CuMg0.4合金的切向微动磨损试验，详细研究了CuMg0.4合金的切向微动运行特性和损伤机理，建立了其运行工况微动图(RCFM)和材料响应微动图(MRFM)。结果表明：CuMg0.4合金的微动运行特性被分为部分滑移机制(PSR)、混合滑移机制(MSR)和完全滑移机制(GSR)。在PSR中，接触中心以弹性变形为主，接触边缘只发生轻微擦伤。在MSR中，黏着区发生强烈的塑性变形，滑移区以表面疲劳磨损和磨粒磨损为主。此外，裂纹在黏-滑边界处萌生并向金属基体内部扩展，次表层的塑性应变累积促进裂纹在此处形核，并最终扩展至接触表面造成剥层。在GSR下，接触表面被严重氧化的第三体层覆盖，磨损机理主要为初始阶段的黏着磨损，稳定阶段的表面疲劳磨损，磨粒磨损。
关键字: 微动磨损；CuMg0.4合金；接触状态；微动图
（School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China）
Abstract:The tangential fretting wear tests of CuMg0.4 alloy were carried out in this paper. The tangential fretting running characteristics and damage mechanisms of CuMg0.4 alloy were studied in detail, and the running condition fretting map (RCFM) and material response fretting map (MRFM) were established. The results show that the fretting characteristics of CuMg0.4 alloy can be divided into partial slip regime (PSR), mixed slip regime (MSR) and gross slip regime (GSR). In the PSR, elastic deformation is dominant in the contact center, and only slightly scratch occurs at the contact edge. In the MSR, severe plastic deformation occurred in the stick zone, and surface fatigue wear and abrasive wear are dominant in the slip zone. In addition, the crack initiates at the stick-slip boundary and propagated into the metal matrix. The accumulation of plastic strain in the subsurface promotes the cracks nucleation here, and these cracks finally extended to the contact surface, resulting in delamination. In the GSR, the contact surface is covered by the oxidized third-body layer, and the wear mechanism is mainly adhesive wear in the initial stage, surface fatigue wear and abrasive wear in the stable stage.
Key words: fretting wear; CuMg0.4 alloy; contact state; fretting map
