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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Carbon Nanotube-Reinforced Aluminum Matrix Composites Produced by High-Energy Ball Milling

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Author(s):
Travessa, Dilermando N. ; da Rocha, Geovana V. B. ; Cardoso, Katia R. ; Lieblich, Marcela
Total Authors: 4
Document type: Journal article
Source: Journal of Materials Engineering and Performance; v. 26, n. 6, p. 2998-3006, JUN 2017.
Web of Science Citations: 3
Abstract

Although multiwall carbon nanotubes (MWCNT) are promising materials to strengthen lightweight aluminum matrix composites, their dispersion into the metallic matrix is challenge. In the present work, MWCNT were dispersed into age-hardenable AA6061 aluminum alloy by high-energy ball milling and the blend was subsequently hot-extruded. The composite bars obtained were heat-treated by solution heat treatment at 520 A degrees C and artificially aged at 177 A degrees C for 8 h, in order to reach the T6 temper. Special attention was given to the integrity of the MWCNT along the entire composite production. The microstructure of the obtained bars was evaluated by optical and scanning electron microscopy, and the mechanical properties were evaluated by Vickers microhardness tests. Raman spectroscopy, x-ray diffraction and transmission electron microscopy were employed to evaluate the structural integrity of MWCNT. It was found that milling time is critical to reach a proper dispersion of the reinforcing phase. The composite hardness increased up to 67% with the dispersion of 2% in weight of MWCNT, when comparing with un-reinforced bars produced by similar route. However, age hardening was not observed in composite bars after heat treatment. It was also found that MWCNT continuously degraded along the process, being partially converted into Al4C3 in the final composite. (AU)

FAPESP's process: 12/07831-2 - Preparation and characterization of aeronautic grade aluminum matrix composites reinforced by carbon nanotubes
Grantee:Dilermando Nagle Travessa
Support type: Scholarships abroad - Research
FAPESP's process: 13/10570-9 - Microstructural characterization of AA6061 aluminum matrix composites reinforced by multi wall carbon nanotubes
Grantee:Dilermando Nagle Travessa
Support type: Regular Research Grants