(西南交通大學(xué) 牽引動(dòng)力國家重點(diǎn)實(shí)驗(yàn)室 摩擦學(xué)研究所，成都 610031)
摘 要: 采用新型扭動(dòng)微動(dòng)試驗(yàn)機(jī)在法向載荷為50、80和110 N及角位移幅值為0.3°~10°的條件下進(jìn)行TA2和 TC4合金與ZrO2對(duì)磨球的扭動(dòng)微動(dòng)試驗(yàn)。在摩擦動(dòng)力學(xué)行為研究的基礎(chǔ)上，結(jié)合磨痕形貌微觀分析，考察TA2和TC4合金的扭動(dòng)微動(dòng)磨損特性。結(jié)果表明：可用摩擦扭矩—角位移曲線和摩擦扭矩時(shí)變曲線表征合金的扭動(dòng)微動(dòng)行為，獲得了TA2和 TC4合金的扭動(dòng)微動(dòng)運(yùn)行工況微動(dòng)圖，TA2合金的混合區(qū)較TC4合金的寬。摩擦扭矩隨法向載荷和角位移幅值的增加而增加，在相同試驗(yàn)條件下，TA2合金的摩擦扭矩始終大于TC4合金的。在部分滑移區(qū)，損傷輕微；在混合區(qū)和滑移區(qū)，損傷加劇，扭動(dòng)微動(dòng)摩擦磨損機(jī)制主要為磨粒磨損、氧化磨損和剝落。
關(guān)鍵字: 鈦；鈦合金；摩擦磨損；微動(dòng)磨損；扭動(dòng)微動(dòng)；磨損機(jī)制
titanium and its alloy
（Tribology Research Institute, Traction Power State Key Laboratory, Southwest Jiaotong University,
Chengdu 610031, China）
Abstract:The torsional fretting tests of alloys TA2 and TC4 flats against ZrO2 ceramic balls were carried out on a new torsional fretting tester under various angular displacement amplitudes ranging from 0.3° to 10° and imposed normal loads of 50, 80 and 110 N. Based on the analysis of the frictional kinetics of the torsional fretting wear and combined with the micro-examinations, the damage characteristics of alloys TC4 and TA2 were also discussed. The results indicate that the behaviors of torsional fretting can be characterized by the curves of friction torque—angular displacement (T—θ) and friction torque curves. Running condition fretting maps of torsional fretting wear for alloys TA2 and TC4 can be set up. The mixed fretting regime of alloy TA2 is wider than that of alloy TC4. The friction torques increase with the increase of the normal loads and angular displacement amplitudes, and alloy TA2 always presents higher friction torques than that of alloy TC4. In the partial slip regime, the damage of torsional fretting wear is slight. In the mixed fretting regime and slip regime, the damage adds, the wear mechanisms of torsional fretting of alloys TC4 and TA2 are mainly abrasive wear, oxidative wear and delamination.
Key words: titanium; titanium alloy; friction and wear; fretting wear; torsional fretting; wear mechanism
