Journal
METALS
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/met11060969
Keywords
aluminium-matrix composites; AA7075; high energy ball milling (HEBM); multiwall carbon nanotubes (MWCNT); powder metallurgy; extrusion
Funding
- Ministry of Science, Innovation and Universities
- European Regional Development Fund ERDF [MAT2017-83825-C4-2-R]
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Metal-matrix composites of aluminium alloy 7075 containing multiwall carbon nanotubes were developed using powder metallurgy and high energy ball milling for dispersion. Characterization of the AA7075-MWCNT powder showed microstructural changes and a fine dispersion of reinforcement into the matrix. Results of mechanical tests indicated that the addition of 0.5 wt.% MWCNTs significantly improved the ductility of the composites.
Metal-matrix composites (MMC) of aluminium alloy 7075 (AA7075) containing 1 wt.% and 0.5 wt.% multiwall carbon nanotubes (MWCNTs) were developed by powder metallurgy, using a high energy ball milling (HEBM) process for dispersion of the MWCNTs. The powder of the AA7075-MWCNT obtained was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microstructural changes produced during the milling process, such as the modification of the crystallite size, as well as the micro-deformation of the matrix crystal lattice, were determined using the Scherrer formula. After consolidation into a strip shape using the hot powder extrusion (HPE) process at 500 degrees C, no porosity was detected and a fine homogeneous dispersion of the reinforcement into the matrix was obtained. After performing a 0.2 HV test and tensile tests in the extruded profiles of both composites, a better combination of properties was found in samples of AA7075-0.5 wt.% MWCNT, with the increase in measured ductility being especially remarkable.
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