Structural evaluation of mechanically alloyed W-50at%C powders
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2017
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Materials Science Forum
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Resumo
Tungsten carbide is potentially attractive for development of catalysts and widely used
for fabrication of cutting tools due to its high hardness and wear resistance while the ball milling
can improve the mechanical properties from the metastable structures and nanomaterials. The aim
of this work was to evaluate the phase transformations during milling of the W-50at%C elemental
powder mixture under argon atmosphere in a planetary P-5 ball mill using WC-Co balls (10 mm
diameter) and vials (225 mL), 200 rpm, and a ball-to-powder weight ratio of 10:1. Samples were
collected into the vial after different times: 20, 60, 300 and 600 min. The as-milled W-50at%C
powders were characterized by X-ray diffraction (XRD). Only peaks of W were identified in
W-50at%C powders milled up to 600 min, which were broadened and moved to the direction of
smaller diffraction angle. In addition, the lattice parameter and cell volume of W were reduced
during ball milling of W-50at%C powders, indicating that the C atoms dissolved into the W lattice
in order to form metastable structures. Carbon atoms were interstitially dissolved into the W lattice
during the initial milling times, and its preferential substitutional dissolution was identified for
longer times due to the larger amounts of crystallographic defects during ball milling.
Como referenciar
SILVA, GUSTAVO S. de A. e; LEAL NETO, RICARDO M.; HENRIQUES, VINICIUS A.R.; CAIRO, CARLOS A.A.; RAMOS, ALFEU S. Structural evaluation of mechanically alloyed W-50at%C powders. Materials Science Forum, v. 899, p. 9-12, 2017. DOI: 10.4028/www.scientific.net/MSF.899.9. Disponível em: http://repositorio.ipen.br/handle/123456789/27918. Acesso em: 26 Apr 2024.
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