Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/107778
Title: Effect of Reinforcement Type and Dispersion on the Hardening of Sintered Pure Aluminium
Authors: Emadinia, Omid 
Vieira, Maria Teresa 
Vieira, Manuel
Keywords: Aluminumpowder; nanocomposite; reinforcement; dispersion; electronmicroscopy; hardness
Issue Date: 2018
Publisher: MDPI
Project: PEst-C/EME/UI0285/2013 
metadata.degois.publication.title: Metals
metadata.degois.publication.volume: 8
metadata.degois.publication.issue: 10
Abstract: The homogeneity of dispersion and reinforcing of pure aluminium by multi-walled carbon nanotubes (MWCNT) through the application of a high speed sonication (340 Hz) assisted by ultrasonication (35 kHz) was evaluated, this method was termed “assisted sonication”. Other reinforcements (graphene, nanoalumina, and ultrafine tungsten carbide) were used for comparison with the MWCNT. The hardness measurement enabled us to evaluate the strengthening effect of the reinforcements. Raman analysis was the technique selected to evaluate the integrity of MWCNTs during dispersion. The scanning and transmission electron microscopies revealed the dispersion and microstructure of the nanoreinforcements and nanocomposites. After applying the assisted sonication, the MWCNTs were detangled without exfoliation. The integrity of MWCNTs was strongly influenced by the presence of the aluminum powder during dispersion. The application of the assisted sonication method reduced the size of the aggregates in the matrix, in comparison with the sonication technique. Ultrafine tungsten carbide, with a 1 vol. %, was the reinforcement that more effectively hardened aluminum due to a good dispersion of the reinforcement, grain refinement and the formation of Al12W phase.
URI: https://hdl.handle.net/10316/107778
ISSN: 2075-4701
DOI: 10.3390/met8100786
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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