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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Fabrication and properties of dispersed carbon nanotube-aluminum composites
Materials Science and Engineering: A, Volume 508, No. 1-2, Year 2009
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Description
Powder metallurgy techniques have emerged as promising routes for the fabrication of carbon nanotube (CNT) reinforced metal matrix composites. In this work, planetary ball milling was used to disperse 2 wt% MWCNT in aluminum (Al) powder. Despite the success of ball milling in dispersing CNTs in Al powder, it is often accompanied with considerable strain hardening of the Al powder, which may have implications on the final properties of the composite. Both un-annealed and annealed Al-2 wt% CNT composites were investigated. It was found that, ball-milled and extruded (un-annealed) samples of Al-2 wt% CNT demonstrated high notch-sensitivity and consistently fractured outside the gauge length during tensile testing. In contrast, extruded samples annealed at 400 and at 500 °C for 10 h prior to testing, exhibited more ductile behavior and no notch sensitivity. Under the present investigated processing conditions, ball milling for 3 h followed by hot extrusion and annealing at 500 °C resulted in enhancements of around 21% in tensile strength compared with pure aluminum with the same process history. The ball-milling conditions used were found to result in the creation of a nanostructure in all samples produced, as shown by XRD and TEM analysis. Such nanostructure was retained after prolonged exposures to temperatures up to 500 °C. The tensile testing fracture surfaces showed uniform dispersion and alignment of the CNTs in the aluminum matrix but also showed CNTs acting as nucleation sites for void formation during tensile testing. This has contributed to the observation of CNT pull-out due to the poor bond between the CNTs and the matrix. © 2009 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Esawi, Amal M.K.
Egypt, New Cairo
American University in Cairo
Morsi, Khaled B.
United States, San Diego
San Diego State University
Sayed, Ahmed Abdel Aziz
Egypt, New Cairo
American University in Cairo
Gawad, Ahmed Abdel
Egypt, New Cairo
American University in Cairo
Borah, P.
United States, San Diego
San Diego State University
Statistics
Citations: 408
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1016/j.msea.2009.01.002
ISSN:
09215093
Research Areas
Environmental