4.6 Article

Carbon nanotubes reinforced aluminum matrix composites with high elongation prepared by flake powder metallurgy

期刊

DIAMOND AND RELATED MATERIALS
卷 107, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.107907

关键词

Carbon nanotubes; Al matrix composite; Flake powder metallurgy; Hot extrusion; High elongation

资金

  1. Science Foundation of the Yunnan Provincial Science and Technology Department [2018FB085]
  2. Rare and Precious Metal Materials Genome Engineering Project of Yunnan Province [2018ZE007, 2019ZE001-3]

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High elongation aluminum matrix composites reinforced with carbon nanotubes (CNTs) were prepared by flake powder metallurgy, and densified by hot extrusion with a high extrusion ratio. After hot extrusion, fine and equiaxed grains were obtained in 2 wt% CNT/Al composite, and interfacial product (Al4C3) as well as bridge-connected CNTs aligned along the extrusion direction were found both in 1 wt% CNT/Al and 2 wt% CNT/Al composites. Both composites obtained high elongation while their strength was enhanced. Especially the elongation of 2 wt% CNT/Al composite is comparable to that of pure Al prepared by the same method, which reached about 30%. The good ductility mainly attributes to firm interfacial combination between CNTs and matrix, fine and equiaxed grains formed by dynamic recrystallization during hot extrusion, and bridge-connected CNTs aligned along the extrusion direction.

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