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Wear behavior of the raw and pre-smashed carbon nanotubes reinforced 6061Al composites fabricated by powder metallurgy

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Abstract

The raw and pre-smashed (PS) carbon nanotube (CNT) reinforced 6061Al composites (CNT/6061Al) with different CNT contents were respectively fabricated by powder metallurgy technology. It was found that reducing the CNT cluster size by pre-smashing processing could sharply reduce the friction coefficient, and significantly improve the density, hardness, and wear resistance of the CNT/6061Al composites. For the raw-CNT/6061Al composites, the wear rate increased approximately linear trend while the CNT content was over 1 wt.%. The plastic deformation, deep grooves, and serious delamination were presented on the wear surface. The wear process was gradually transformed from Al-copper base counterpart wear into Al-Al wear for the higher adhesion-binding energy between aluminum and copper base counterpart. While for the PS-CNT/6061Al composites, the wear rate gradually decreased as the CNT content increased from 0 to 2 wt.%. This was mainly because the generation of the thinner mechanically mixed layer (MML) and the PS-CNT prevented the direct contact between specimen and copper base counterpart, which effectively inhibited the adhesive wear. But excessive PS-CNT addition (∼3 wt.%) would weaken the bonding between CNT and 6061Al, and thus the wear resistance of the composite was reduced apparently.

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Correspondence to ZhenYu Liu or BoLü Xiao.

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This work was supported by the National Key R&D Program of China (Grant No. 2017YFB0703104), the Key Research Program of Frontier Sciences, CAS (Grant No. QYZDJ-SSW-JSC015), the National Natural Science Foundation of China (Grant Nos. 51931009, 51871214, 51871215), and the Youth Innovation Promotion Association CAS (Grant No. 2020197).

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Li, X., Liu, Z., Zan, Y. et al. Wear behavior of the raw and pre-smashed carbon nanotubes reinforced 6061Al composites fabricated by powder metallurgy. Sci. China Technol. Sci. 65, 1149–1159 (2022). https://doi.org/10.1007/s11431-020-1817-3

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  • DOI: https://doi.org/10.1007/s11431-020-1817-3

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