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王树奇,陈伟,张本国,姜伟,崔向红.Ti-6Al-4V热浸镀铝涂层干滑动磨损行为的实验研究[J].稀有金属材料与工程(英文),2019,48(6):1762~1768.[Wang Shuqi,Chen Wei,Zhang Benguo,Jiang Wei and Cui Xianghong.An experimental investigation on dry sliding wear behavior of hot-dip aluminized Ti-6Al-4V alloy[J].Rare Metal Materials and Engineering,2019,48(6):1762~1768.]
An experimental investigation on dry sliding wear behavior of hot-dip aluminized Ti-6Al-4V alloy
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Received:January 27, 2018  Revised:June 14, 2019
Key words: aluminized Ti-6Al-4V alloy  sliding wear  wear behavior  tribo-layer  wear mechanism
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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Wang Shuqi,Chen Wei,Zhang Benguo,Jiang Wei and Cui Xianghong  
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      An aluminized coating of TiAl3 was prepared on Ti-6Al-4V alloy by hot-dip aluminizing and subsequently high-temperature diffusion at 650 ℃. Dry sliding wear behavior was conducted for the aluminized Ti-6Al-4V alloy against GCr15 steel on a pin-on-disc wear tester. The morphology, phase and composition of worn surface of the HDA coatings were characterized by SEM, XRD, EDS and XPS. The wear mechanism was also explored. The research result demonstrated that with an increase of sliding velocity, the wear loss of the aluminized Ti-6Al-4V alloy decreased to a lower value at 0.75 m/s, then increased to the highest at 2.68 m/s and finally decreased to the lowest at 4 m/s. At different sliding velocities, the wear loss increased with an increase of load. Tribo-layers were identified to notably affect the wear behavior and mechanism. At 4 m/s, oxide-containing tribo-layers (TiO and TiO2) possessed an obvious wear-reduced function; conversely at 2.68 m/s, no-oxide ones did not show the protection from wear. Compared with uncoated Ti-6Al-4V alloy, the aluminized coating improved the wear resistance of the titanium alloy under various conditions, especially 4 m/s. The improved wear performance was suggested to be attributed to Ti-Al coating and tribo-oxide layer.