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Title: Characterization of Sintered Aluminium Reinforced with Ultrafine Tungsten Carbide Particles
Authors: Emadinia, Omid 
Vieira, Maria Teresa 
Vieira, Manuel Fernando
Keywords: aluminium; ultrafine tungsten carbide; sintering; strengthening; mechanical properties; microstructure
Issue Date: 2020
Publisher: MDPI
Project: UIDB/00285/2020 
Serial title, monograph or event: Metals
Volume: 10
Issue: 11
Abstract: The strengthening e ect on aluminium (Al) by ultrafine particles of tungsten carbide (WC) after compacting and sintering was evaluated. The Al-1 vol.% WC mixture was prepared through a high-speed stirring technique, called assisted sonication. In this study, the e ects of compacting, sintering temperature and holding time were evaluated by composite microstructural characterization and by mechanical tests. The characterizations involved electron dispersive spectroscopy and X-ray di raction techniques for phase identification; electron backscattered di raction for crystallographic analysis; backscattered electrons and secondary electrons imaging for failure and wear studies. In all composites, hardness was determined; for the hardest composite, the tensile strength, flexural strength and ball scattering wear resistance were also evaluated. The Al-1 vol.% WC composite produced by assisted sonication, densified by cold compacting at 152 MPa and sintered at 640 C for 2 h at 5 10􀀀4 Pa (high vacuum) exhibited the highest hardness, associated with an acceptable ductile behavior. This strengthening was associated with the formation of Al12W and grain refinement.
ISSN: 2075-4701
DOI: 10.3390/met10111416
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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