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首页> 外文期刊>Materials Science and Engineering >Enhanced mechanical properties and high electrical conductivity in multiwalled carbon nanotubes reinforced copper matrix nanolaminated composites
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Enhanced mechanical properties and high electrical conductivity in multiwalled carbon nanotubes reinforced copper matrix nanolaminated composites

机译：多壁碳纳米管增强的铜基纳米层压复合材料的增强的机械性能和高电导率

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摘要

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.
机译：通过片状粉末冶金已经成功地制备了具有纳米层状结构的多壁碳纳米管/铜（MWCNTs / Cu）复合材料。关键策略是使碳纳米管均匀分散在铜基体和层状结构中，从而提高加固效率和结构韧性。结果，该复合材料显示出平衡的破坏强度和伸长率以及高电导率。 1.0％（体积）MWCNTs / Cu层状复合材料的抗拉强度为395 MPa，比粗粒Cu高87％。同时，强度的提高不会引起失效伸长率和导电率的严重降低。复合材料中保留了超过20％的令人满意的均匀伸长率和超过90％的国际退火铜标准（IACS）。通过原位数字图像相关性和X射线断层扫描进行的表征表明，载荷过程中有效的应力传递以及引导裂纹扩展的层状结构，有助于实现良好的强度-伸长率平衡。另外，由于层压结构，复合材料的电导率是各向异性的。

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