Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
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Seung I. Cha
Abstract
Microstructure and mechanical properties of ultra-fine WC-10Co-X cemented carbides were investigated.Nanocrystalline WC-10Co-X powders with an average WC size of 100 nm were prepared by spray drying of solution containing ammonium metatungstate and cobalt nitrate. Varying amounts of TaC, Cr3C2 and VC were added into ultra-fine WC-10Co cemented carbides as grain growth inhibitors. The hardness of WC-10Co cemented carbides increased with decreasing WC grain size following the Hall – Petch-type relationship. The fracture toughness of ultra-fine WC-10Co fabricated by the spray conversion process was lower than that of conventional WC-10Co. These differences in fracture toughness arose from solute content in the Co binder phase. The fracture toughness of WC-10Co-X cemented carbides with the same solute content in the Co binder phase varied with WC grain size and Co mean free path.
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© 2005 Carl Hanser Verlag, München
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- Materials Week
- Conferences/ Konferenzen
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Solute drag illustrated graphically
- Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
- Anomalous behaviour in diffusion impedance of intercalation electrodes
- A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
- Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
- Microstructure development during liquid-phase sintering
- The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
- Three-dimensional morphological characterization of coarsened microstructures
- Faceting and migration of twin grain boundaries in zinc
- Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
- Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
- Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
- Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
- The influence of singular surfaces and morphological changes on coarsening
- Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
- Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
- Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
- The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
- Notifications/Mitteilungen
- Personal/Personelles
- Materials Week
- Conferences/ Konferenzen
