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