Ti-Al-Zr钛合金的高温微动磨损行为研究

Study on High Temperature Fretting Wear of Ti-Al-Zr Alloy

采用高精度液压式高温微动磨损试验机研究了Ti-Al-Zr钛合金在室温和400℃下的微动磨损行为;分析了其摩擦系数、磨损体积以及磨损表面和截面形貌;探讨了其微动磨损机理及氧化磨屑的作用机理。试验结果表明:与室温相比,在微动初始阶段,400℃时的摩擦系数较高,而在稳定阶段两者相当;在相同载荷、位移幅值条件下,400℃时的磨损体积较室温大,在相同温度下,磨损体积随着载荷的增加而增大;室温时的磨损主要以剥层机制和磨粒磨损为主,而高温(400℃)主要以剥层、氧化磨损和粘着机制为主;摩擦学白层对在损伤过程中起重要作用。

This paper focuses on the fretting wear behavior of Ti-Al-Zr alloy carried out on a high precision hydraulic fretting wear test rig respectively at ambient and high temperature（400℃）.An experimental layout was designed to perform analysis of the friction coefficient,wear volume and morphology of the worn surface and cross-sections,and investigate the mechanism of fretting wear and wear debris.Experimental testing shows that friction coefficient at 400℃,compared with the ambient,was higher in initial stage,but both were little difference observed in steady stage.The wear volume at 400℃,under the same normal loads and displacement amplitudes,was larger than that at room temperature,and the wear increased with the increase of normal loads at the same temperature.At ambient,the damage mechanism of Ti-Al-Zr alloy was mainly delamination and abrasive wear,while the damage mechanism at 400℃ was primarily the combination of delamination,oxidative and adhesive wear.Based on the results,tribologically transformed structure played an important role in the fretting wear models.