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Tribological Behavior of Carbon Nanotube-Reinforced AZ91D Composites Processed by Cyclic Extrusion and Compression

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Abstract

Reciprocating wear tests were conducted to assess the wear resistance of CNT-reinforced AZ91D composites prepared by cyclic extrusion and compression (CEC). Effects of CEC, CNTs, and wear parameters on the tribological behavior of the composites were discussed. Results show that the matrix grain of the 0.5 wt% CNTs/AZ91D composites is largely refined from ~ 112 µm to 126.6 nm after eight passes of CEC. Accordingly, the hardness of the composites is increased by more than 82.0%. The wear rate of the CNTs/AZ91D composites decreases with the implement of CEC and the addition of CNTs. The lubrication effect of CNTs diminishes after CEC. Besides the reinforcing effect, the incorporated CNTs help to liberate the friction heat of the CNTs/AZ91D composites and reduce the welding of the wear debris due to their extraordinary thermal conductivity.

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (NSFC) [Grant Numbers 51674166, 51374145, 51074106, 50674067] and the Science and Technology Commission of Shanghai Municipality [Grant Number 09JC1408200].

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Correspondence to Qudong Wang.

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Zhang, L., Wang, Q., Liu, G. et al. Tribological Behavior of Carbon Nanotube-Reinforced AZ91D Composites Processed by Cyclic Extrusion and Compression. Tribol Lett 66, 71 (2018). https://doi.org/10.1007/s11249-018-1018-x

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Keywords

  • Magnesium composites
  • Carbon nanotubes
  • Cyclic extrusion compression
  • Wear mechanism