On shear-lag and thermal mismatch model in multiwalled carbon nanotube/copper matrix nanocomposites
On shear-lag and thermal mismatch model in multiwalled carbon nanotube/copper matrix nanocomposites
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DOI：
10.1016/j.jallcom.2012.09.073
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发表时间：
2013-02
影响因子：
6.2
通讯作者：
P. Koppad;H. R. A. Ram;K. T. Kashyap-
中科院分区：
文献类型：
--
作者：
P. Koppad;H. R. A. Ram;K. T. Kashyap-
采用粉末冶金工艺和热锻工艺制备了不同MWCNT质量分数的镍包覆和未包覆MWCNT/Cu纳米复合材料。通过透射电子显微镜的微观结构表征揭示了多壁碳纳米管在晶粒内部和晶界处的均匀分散。增加的弹性模量和硬度，由于纳入未涂覆和镍涂覆的多壁碳纳米管观察到纳米压痕。3 wt.%的弹性模量和硬度镍包覆MWCNT/Cu纳米复合材料的复合强度分别比3 wt.%未涂覆的MWCNT/Cu纳米复合材料。这些结果为镍涂层在实现MWCNT和铜基体之间的良好界面结合以在变形期间有效地传递载荷和开发高强度复合材料中的重要性提供了证据。采用剪切滞后和热失配模型对纳米复合材料的力学性能进行了理论估算。
Nickel-coated and uncoated multiwalled carbon nanotube/copper (MWCNT/Cu) nanocomposites with different MWCNT weight fractions were fabricated by powder metallurgy processes and subsequent hot forging. Microstructural characterization by transmission electron microscopy revealed a uniform dispersion of MWCNTs both inside the grains and at the grain boundaries. Increased elastic modulus and hardness, due to incorporation of uncoated and nickel-coated MWCNTs was observed by nanoindentation. The elastic modulus and hardness of the 3wt.% nickel-coated MWCNT/Cu nanocomposite were increased by 7% and 14% respectively compared to 3wt.% uncoated MWCNT/Cu nanocomposite. These results provides evidence for the importance of the nickel coating in achieving a good interfacial bond between the MWCNTs and the copper matrix for efficient load transfer during deformation and for the development of high strength composites. The mechanical properties of nanocomposites were theoretically estimated using shear-lag and thermal mismatch model.