(西南交通大學(xué) 機械工程學(xué)院，成都 610031)
摘 要: 本文開展了CuMg0.4合金的切向微動磨損試驗，詳細研究了CuMg0.4合金的切向微動運行特性和損傷機理，建立了其運行工況微動圖(RCFM)和材料響應(yīng)微動圖(MRFM)。結(jié)果表明：CuMg0.4合金的微動運行特性被分為部分滑移機制(PSR)、混合滑移機制(MSR)和完全滑移機制(GSR)。在PSR中，接觸中心以彈性變形為主，接觸邊緣只發(fā)生輕微擦傷。在MSR中，黏著區(qū)發(fā)生強烈的塑性變形，滑移區(qū)以表面疲勞磨損和磨粒磨損為主。此外，裂紋在黏-滑邊界處萌生并向金屬基體內(nèi)部擴展，次表層的塑性應(yīng)變累積促進裂紋在此處形核，并最終擴展至接觸表面造成剝層。在GSR下，接觸表面被嚴(yán)重氧化的第三體層覆蓋，磨損機理主要為初始階段的黏著磨損，穩(wěn)定階段的表面疲勞磨損，磨粒磨損。
關(guān)鍵字: 微動磨損；CuMg0.4合金；接觸狀態(tài)；微動圖
（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
