Enhanced mechanical properties and high electrical conductivity in multiwalled carbon nanotubes reinforced copper matrix nanolaminated composites

Multiwalled carbon nanotubes/copper (MWCNTs/Cu) composites with a nanolaminated structure have been successfully prepared via flake powder metallurgy. The key strategies are to achieve uniform dispersion of carbon nanotubes in copper matrix and laminated structure, leading to high strengthening effi...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-06, Vol.729, p.452-457
Main Authors: Liu, Jiapeng, Xiong, Ding-Bang, Tan, Zhanqiu, Fan, Genlian, Guo, Qiang, Su, Yishi, Li, Zhiqiang, Zhang, Di
Format: Article
Language:English
Subjects:
Carbon nanotube
Composite materials
Conductivity
Copper
Crack propagation
Digital imaging
Electrical conductivity
Electrical resistivity
Elongated structure
Fracture toughness
Laminated structure
Mechanical properties
Metal matrix composites
Multi wall carbon nanotubes
Nanotubes
Powder metallurgy
Strength
Strengthening
Stress propagation
Toughening
X ray imagery
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Summary:Multiwalled carbon nanotubes/copper (MWCNTs/Cu) composites with a nanolaminated structure have been successfully prepared via flake powder metallurgy. The key strategies are to achieve uniform dispersion of carbon nanotubes in copper matrix and laminated structure, leading to high strengthening efficiencies and architecture toughening. As a result, the composites show balanced failure strength and elongation and high electrical conductivity. The tensile strength of 1.0 vol% MWCNTs/Cu laminated composite is 395 MPa, 87% higher than that of coarse-grained Cu. At the same time, the enhancement on strength does not cause serious deterioration in failure elongation and electrical conductivity. A satisfied uniform elongation in excess of 20% and an electrical conductivity more than 90% International Annealed Copper Standard (IACS) are retained in the composite. Characterizations by in-situ digital image correlation and X-ray tomography indicate efficient stress transferring during loading as well as laminated structure guiding crack propagation, contributing to the good strength-elongation balance. Additionally, the electrical conductivity of the composites is anisotropic because of the laminated structure.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.05.091