Wear Behavior of the Uniformly Dispersed Carbon Nanotube Reinforced 6061Al Composite Fabricated by Milling Combined with Powder Metallurgy

doi:10.1007/s40195-022-01405-7

Abstract

Abstract:

The uniformly dispersed carbon nanotubes (CNTs) reinforced 6061Al composites (CNT/6061Al) with different CNT concentrations were fabricated by powder metallurgy technology. It was found that the friction coefficient as well as wear rate decreased first and then increased as the CNT concentration increasing under 15 N as well as 30 N, and the minimum wear rate was achieved at the CNT concentration of 2 wt%. Adhesive wear and abrasive wear were the dominated wear mechanisms for the 1-2 wt% CNT/6061Al composites under 15 N and 30 N, while the delamination occurred on the wear surface at 3 wt% CNT. As the applied load increased to 60 N, the wear rate of composites increased dramatically. The wear mechanism transformed from abrasive wear to severe delamination wear, accompanied by the generation of wear debris with sharp edge due to the weaker anti-shearing strain capacity of CNT/6061Al composites.

Key words: Wear mechanism, Carbon nanotube, Aluminum matrix composites, Powder metallurgy

Xiaonan Li, Zhenyu Liu, Zhixin Dai, Hui Feng, Bolyu Xiao, Dingrui Ni, Quanzhao Wang, Dong Wang, Zongyi Ma. Wear Behavior of the Uniformly Dispersed Carbon Nanotube Reinforced 6061Al Composite Fabricated by Milling Combined with Powder Metallurgy[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(11): 1765-1776.

Figures/Tables 16

Fig. 1 SEM images of the as-received a CNT, b 6061Al powders

Fig. 2 TEM images showing the grain and precipitation phase of CNT/6061Al composites with different CNT concentrations: a, e 0 wt%, b, f 1 wt%, c, g 2 wt%, d, h 3 wt%

Fig. 3 a TEM image of individually dispersed CNTs in the 3 wt% CNT/6061Al composite; b Vickers hardness and elongation of CNT/6061Al composites with different CNT concentrations

Fig. 4 Friction coefficient versus the sliding time for the CNT/6061Al composites with different CNT concentrations under a 15 N, b 30 N, c 60 N

Fig. 5 a Friction coefficient, b wear rate of CNT/6061Al composites, c wear rate of counterpart material under different applied loads and CNT concentrations

Fig. 6 SEM images showing the wear surface morphology of CNT/6061Al composites with different CNT concentrations under 30 N: a 0 wt%, b 1 wt%, c 2 wt%, d 3 wt%, 60 N: e 0 wt%, f 1 wt%, g 2 wt%, h 3 wt%

Fig. 7 SEM images showing the wear surface morphology of CNT/6061Al composites with different CNT concentrations under 30 N: a, e 0 wt%, b, f 1 wt%, c, g 2 wt%, d, h 3 wt%

Fig. 8 SEM images showing the wear surface morphology of CNT/6061Al composites with different CNT concentrations under 60 N: a, e 0 wt%, b, f 1 wt%, c, g 2 wt%, d, h 3 wt%

Fig. 9 SEM images showing the wear surface morphology of counterparts for CNT/6061Al composites with different CNT concentrations under 30 N: a 0 wt%, b 1 wt%, c 2 wt%, d 3 wt%, 60 N: e 0 wt%, f 1 wt%, g 2 wt%, h 3 wt%

Fig. 10 SEM images showing the wear debris morphology of the CNT/6061Al composites with different CNT concentrations under 30 N: a 0 wt%; b 1 wt%; c 2 wt%; d 3 wt%; 60 N: e 0 wt%; f 1 wt%; g 2 wt%; h 3 wt%

Fig. 11 3D profilogram of wear tracks for the CNT/6061Al composites with different CNT concentrations under 30 N: a 0 wt%; b 1 wt%; c 2 wt%; d 3 wt%

Fig. 12 3d profilogram of wear tracks for the CNT/6061Al composites with different CNT concentrations under 60 N: a matrix alloy; b 1 wt%; c 2 wt%; d 3 wt%

Fig. 13 Wear subsurface cross sections of CNT/6061Al composites with different CNT concentrations under 30 N: a, e 0 wt%; b, f 1 wt%; c, g 2 wt%; d, h 3 wt%

Fig. 14 EDS analysis of the typical MML for the 2 wt% CNT/6061Al composite

Fig. 15 Wear subsurface cross section of CNT/6061Al composites with different CNT concentrations under 60 N: a, e 0 wt%; b, f 1 wt%; c, g 2 wt%; d, h 3 wt%

Fig. 16 Raman spectra of the wear surfaces of 2 wt% and 3 wt% CNT/6061Al composites under 30 N and 60 N

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