Microstructure evolution and hot deformation behavior of carbon nanotube reinforced 2009Al composite with bimodal grain structure

doi:10.1016/j.jmst.2020.09.003

Abstract

Abstract:

The hot deformation behaviors of the bimodal carbon nanotube reinforced 2009Al (CNT/2009Al) composite were studied by establishing processing map and characterizing the microstructure evolution. The results indicate that the grain size in the ultra-fine grained zones was stable during hot deformation, while the coarse grained zones were elongated with their long axis directions tending to be perpendicular to the compression direction. Low temperature with high strain rate (LTHR), as well as high temperature with low strain rate (HTLR) could increase the length/width ratio of the coarse grained zones. However, LTHR and HTLR could cause the instable deformation. The instable deformation at LTHR was induced by severe intragranular plastic deformation and the localized shear crack, while the instable deformation at HTLR resulted from the more deformation component at the coarse grained zones, and the micro-pore initiation due to CNT re-agglomeration at the boundaries between the coarse and the ultra-fine grained zones.

Key words: Carbon nanotube, Bimodal, Aluminum matrix composite, Hot deformation, Processing map

K. Ma, Z.Y. Liu, X.X. Zhang, B.L. Xiao, Z.Y. Ma. Microstructure evolution and hot deformation behavior of carbon nanotube reinforced 2009Al composite with bimodal grain structure[J]. J. Mater. Sci. Technol., 2021, 70: 73-82.

Figures/Tables 10

Fig. 1. Powder morphologies of (a) the raw CNTs, (b) the raw 2009Al alloy, (c) the ball-milled CNT/2009Al.

Fig. 2. Initial microstructures of as hot-pressed CNT/2009Al composite: (a) OM image of macrostructure, (b) SEM back-scattered electron image and EDS of undissolved phases, (c) TEM image of CNT distribution, and (d) TEM image of grain structure in ultra-fine grain zones.

Fig. 3. Compressive true stress-true strain curves of bimodal CNT/2009Al composite specimens at (a) 450 °C with different strain rates; (b) 1 s-1 with different temperatures.

Fig. 4. Processing maps of bimodal CNT/2009Al composite: (a) power dissipation map; (b) processing map containing instable zone.

Fig. 5. OM images of bimodal CNT/2009Al composite specimens compressed to a true strain of 0.8 at (a) 300 °C with 1 s-1; (b) 450 °C with 1 s-1 and (c) 450 °C with 0.001 s-1.

Fig. 6. The statistical results of (a), (c), (e) average length, width and content of coarse grained zones at strain of 1 s-1 with different temperatures; (b), (d), (f) average length, width and content of coarse grained zones at temperature of 450 °C with different strain rates.

Fig. 7. Grain type distribution maps characterized by EBSD and their proportions in coarse grained zones compressed at (a), (d) 350 °C with 1 s-1, (b) (e) 450 °C with 1 s-1, (c) (f) 450 °C with 0.001 s-1.

Fig. 8. TEM images of bimodal CNT/2009Al composite specimens compressed to a true strain of 0.8 at (a), (b) 350 °C with 1 s-1, (c) (d) 450 °C with 1 s-1, (e) (f) 450 °C with 0.001 s-1.

Fig. 9. The damage morphology of bimodal CNT/2009Al composite specimens compressed at (a) 300 °C with 1 s-1, (b) 450 °C with 0.001 s-1.

Fig. 10. The CNT distribution for the specimens compressed to a true strain of 0.8 at (a), (b) 300 °C with 1 s-1, (c) (d) 450 °C with 0.001 s-1.

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