The Tribological Behavior of a Ti-46Al-2Cr-2Nb Alloy Under Liquid Paraffine Lubrication |
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Authors: | Jun Cheng Jun Yang Jiqiang Ma Qinling Bi Xinghua Zhang Licai Fu Fei Li Shengyu Zhu Weimin Liu |
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Affiliation: | (1) State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China; |
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Abstract: | The tribological behavior of a Ti-46Al-2Cr-2Nb alloy prepared by hot-pressed sintering was investigated under liquid paraffine
lubrication against AISI 52100 steel ball in ambient environment and at varying loads and sliding speeds. For comparison,
the tribological behavior of a common Ti-6Al-4V alloy was also examined under the same testing conditions. The worn surfaces
of the two alloys were analyzed using a scanning electron microscope. The friction coefficient of the Ti-46Al-2Cr-2Nb alloy
in the range of 0.13–0.18 was significantly lower than that of the Ti-6Al-4V alloy (0.4–0.5), but comparable to that under
dry sliding, which indicated that TiAl intermetallics could be more effectively lubricated by liquid paraffine than titanium
alloys. Applied load and sliding speed have little effect on the friction coefficient of the Ti-46Al-2Cr-2Nb alloy. The wear
rate of the Ti-46Al-2Cr-2Nb alloy was about 45–120 times lower than that of Ti-6Al-4V alloy owing to Ti-6Al-4V alloy could
not be lubricated effectively. The wear rate of the Ti-46Al-2Cr-2Nb alloy increased with increasing applied load, but decreased
slightly at first and then increased with increasing sliding speed. The wear mechanism of the Ti-46Al-2Cr-2Nb intermetallics
under liquid paraffine lubrication was dominated by main plowing and slight flaking-off, but that of the Ti-6Al-4V alloy was
plastic deformation and severe delamination. |
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