Fabrication of ultrafine and nanocrystalline WC-Co mixtures by high energy milling
[EN] In this work ultrafine and nanocrystalline WC-Co mixtures were obtained by low energy milling in planetary ball mill. The effect of the processing conditions on the reduction and distribution of the grain sizes and the internal strains level were studied. The characterisation of the powder mixt...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/100591 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/100591 |
| Access Level: | acceso abierto |
| Palabra clave: | Mechanical properties Microstrain Nanocrystalline powders Planetary ball mill WC-Co Characterisation Grain size Internal strains Low energies Nanocrystalline WC-Co Nanocrystallines Planetary milling Powder mixtures Processing condition Scanning and transmission electron microscopy SEM and TEM Ultrafine Wet milling Ball milling Ball mills Crystallite size Diffraction Grain growth Grain size and shape Milling (machining) Mixtures Sintering Transmission electron microscopy Tungsten alloys X ray diffraction X ray diffraction analysis CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA |
| Sumario: | [EN] In this work ultrafine and nanocrystalline WC-Co mixtures were obtained by low energy milling in planetary ball mill. The effect of the processing conditions on the reduction and distribution of the grain sizes and the internal strains level were studied. The characterisation of the powder mixtures was performed by means of scanning and transmission electron microscopy and X-ray diffraction analysis. Observations through SEM and TEM images showed a particle size below 100 nm, after milling. The X-ray diffraction profile analysis revealed a WC phase refined to a crystallite size of 19 nm. The mixtures obtained have been consolidated and mechanical and microstructurally characterised. The results show improvements in resistant behaviour of the material consolidated from nanocrystalline powders, in spite of the grain growth experienced during the sintering. The best results were found for the material obtained by wet milling during 100 h, which presents values of hardness higher than 1800 HV. © 2011 Institute of Materials, Minerals and Mining. |
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