Structural Evaluation of Mechanically Alloyed W-50at%C Powders

Abstract:

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.

• Periodical: Materials Science Forum (Volume 899)
• Pages: 9-12
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.899.9
• Online since: July 2017
• Authors: Gustavo Souza de Alencar e Silva*, Ricardo Mendes Leal Neto, Vinícius André Rodrigues Henriques, Carlos Alberto Alves Cairo, Alfeu Saraiva Ramos
• Keywords: Ceramics, Mechanical Alloying, Tungsten Carbide

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