Microstructure and mechanical property of multi-walled carbon nanotubes reinforced aluminum matrix composites fabricated by friction stir processing |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;2. National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, PR China;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA;1. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University, Suwon, 440-746, Republic of Korea;2. Department of Energy Science, Sungkyunkwan University, Suwon, 440-746, Republic of Korea;1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Canada N2L 3G1;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2V4;1. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan;2. DEN/DANS/DMN/SRMA/LTMEx, CEA Saclay, 91191, GIF sur YVETTE Cedex, France;3. Technical Division, School of Engineering, Tohoku University, Sendai, 980-8579, Japan |
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| Abstract: | Aluminum matrix composites reinforced by different contents of multi-walled carbon nanotubes (MWCNTs) were fabricated by friction stir processing (FSP). The microstructure of nano-composites and the interface between aluminum matrix and MWCNTs were examined using optical microscopy (OM) and transmission electron microscopy (TEM). It was indicated that MWCNTs were well dispersed in the aluminum matrix throughout the FSP. Tensile tests and microhardness measurement showed that, with the increase of MWCNT content, the tensile strength and microhardness of MWCNTs/Al composites gradually increased, but on the contrary, the elongation decreased. The maximum ultimate tensile strength reached up to 190.2 MPa when 6 vol.% MWCNTs were added, and this value was two times more of that of aluminum matrix. Appearances and fracture surface micrographs of failed composite samples indicated that the composites become more and more brittle with the increase of the MWCNT content. |
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