Journal
MATERIALS & DESIGN
Volume 142, Issue -, Pages 288-296Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.01.044
Keywords
Aluminum matrix composites; Flake powder metallurgy; Carbon nanotubes; Pre-dispersion; Dry particle coating; Mechanical properties
Categories
Funding
- National Key Research and Development Program of China [2017YFB1201105, 2016YFB1200506, 2016YFE0130200]
- Natural Science Foundation of China [51671130, 51401123, 51371115]
- Ministry of Education of China [62501036031, B16032]
- Shanghai Science & Technology Committee [17ZR1441500, 17520712400, 15JC1402100, 14DZ2261200, 14520710100]
- JWRI International Research Collaboration
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A flake powder metallurgy route that combines high-shear pre-dispersion process with shift-speed ball milling was designed to fabricate carbon nanotube reinforced aluminum composites. In order to mitigate the dispersion responsibility of ball milling and improve the dispersion efficiency, high-shear pre-dispersion process utilizing the mechanism of dry particle coating was firstly applied to CNTs and 6061Al powder mixtures for a few minutes to de-agglomerate CNTs and uniformly coat them onto surface of 6061Al powder. It was demonstrated that, for the pre-dispersed powders, more rapid and uniform dispersion of CNTs was achieved during following shift-speed ball milling process, which in turn protected CNTs from additional damage and led to better interfacial bonding and higher reinforcing efficiency. As results, compared to counterpart without pre-dispersion, the as-extruded bulk 1.5 wt% CNT/6061Al composites exhibited simultaneous enhancement in Young's modulus, tensile strength and ductility. (c) 2018 Elsevier Ltd. All rights reserved.
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