Anisotropy of the Wear Behavior for Carbon Nanotube-Reinforced 6061Al Composites

doi:10.1007/s40195-022-01499-z

Abstract

Abstract:

Carbon nanotube (CNT)-reinforced 6061Al (CNT/6061Al) composites with directionally aligned CNT were fabricated, and their wear behavior was investigated. The results indicate that the wear properties of CNT/6061Al composites exhibited a significant anisotropy. A certain CNT concentrations (1 wt% and 2 wt%) could effectively improve the wear resistance of CNT/6061Al composites along the CNT circumferential and CNT radial directions for the load transfer, grain refinement and self-lubrication effect of CNT. The Brass {011} < 211 > and {112} < 110 > textures inhibited the load transfer effect of CNT along the CNT radial direction, resulting in a better wear resistance along CNT circumferential direction than CNT radial direction. Along the CNT axial direction, the weak deformability of composites caused by the intensifying < 111 > fiber texture was the main reasons for the poor wear resistance of CNT/6061Al composites with increasing CNT concentration.

Key words: Carbon nanotube, Metal matrix composite, Wear, Anisotropy

X.N. Li, J.F. Zhang, W.H. Xue, K. Ma, P.Y. Li, Z.Y. Liu, B.L. Xiao, D.R. Ni, Q.Z. Wang, D. Wang, Z.Y. Ma. Anisotropy of the Wear Behavior for Carbon Nanotube-Reinforced 6061Al Composites[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(5): 814-826.

Figures/Tables 14

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

Fig. 2 Schematic illustration for a sampling method and b friction directions of CNT/6061Al composites

Fig. 3 Schematic of the experimental approach of wear test

Fig. 4 TEM images: a singly dispersed and aligned CNTs; b CNT-Al interface in the 3 wt% CNT/6061Al composite

Fig. 5 a Vickers hardness, b tensile properties and c PSP of CNT/6061Al composites with different CNT concentrations

Fig. 6 Friction coefficient a and wear rate b changing curves of CNT/6061Al composites with different CNT concentrations along different friction directions

Fig. 7 SEM images of wear surfaces for CNT/6061Al composites with different CNT concentrations along different friction directions: a-c CNT circumferential direction, d-f CNT radial direction and g-i CNT axial direction

Fig. 8 3D morphologies of wear tracks for the CNT/6061Al composites with different CNT concentrations along different friction directions: a-c CNT circumferential direction, d-f CNT radial direction and g-i CNT axial direction. The maximum depth of wear tracks are also marked in this figure

Fig. 9 The Mises stresses of a-c CNT and d-f 6061Al matrix along three different shear directions for 2 wt% CNT/6061Al composite

Fig. 10 Raman spectra of the a 2 wt% and b 3 wt% CNT/6061Al composites before and after the wear tests along different friction directions

Fig. 11 Transmission electron microscopy (TEM) images showing grain structure of the CNT/6061Al composites with different CNT concentrations along: a-c extrusion direction and d-f vertical extrusion direction

Fig. 12 Pole figures and ODFs of CNT/6061Al composites with different CNT concentrations along the extrusion direction: a, d 0 wt%, b, e 2 wt%, c, f 3 wt%

Fig. 13 Pole figures and ODFs of CNT/6061Al composites with different CNT concentrations along the vertical extrusion direction: a, d 0 wt%, b, e 2 wt%, c, f 3 wt%

Fig. 14 Maximum intensity of main textures in CNT/6061Al composites with different CNT concentrations along the extrusion direction and vertical extrusion direction. The maximum schmid factors of the main texture components are also given

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