Production and Properties of High Entropy Carbide Based Hardmetals
Open Access
- 5 February 2021
- Vol. 11 (2), 271
- https://doi.org/10.3390/met11020271
Abstract
Dense, high-entropy carbide cobalt-bonded hardmetals with two different compositions, namely (Hf-Ta-Ti-Nb-V)C-19.2 vol% Co and (Ta-Ti-Nb-V-W)C-19.2 vol% Co, were successfully manufactured by gas pressure sintering (SinterHIP) at 1400 °C and 100 bar Ar pressure. The microstructure of these hardmetals consists of a rigid skeletal carbide phase embedded in a tough Co binder phase. EDS mappings showed that the high-entropy carbide phase did not decompose and that a typical hardmetal microstructure was realized. Only in the case of the (Hf-Ta-Ti-Nb-V)C-Co hardmetal was some undissolved TaC and HfO2, as well as some clustered vanadium titanium carbide phase, found, resulting in a split-up of the HEC phase into two very similar HEC phases. This resulted in a reduced hardness to fracture toughness ratio for this composition. Measurements of magnetic saturation polarization showed values between 57.5% and 70% of theoretical magnetic saturation polarization, indicating marginal dissolution of the carbide-forming metal elements in the binder phase. The hardness value HV10 for (Hf-Ta-Ti-Nb-V)C-19.2 vol% Co was 1203 HV10 and 1432 HV10 for (Ta-Ti-Nb-V-W)C-19.2 vol% Co.Keywords
This publication has 32 references indexed in Scilit:
- Mechanical properties of large TiC-Mo-Ni cermet tilesInternational Journal of Refractory Metals and Hard Materials, 2018
- NbC grain growth control and mechanical properties of Ni bonded NbC cermets prepared by vacuum liquid phase sinteringInternational Journal of Refractory Metals and Hard Materials, 2018
- Potential of niobium carbide application as the hard phase in cutting tool substrateInternational Journal of Refractory Metals and Hard Materials, 2018
- Microstructure and mechanical properties of NbC-matrix hardmetals with secondary carbide addition and different metal bindersInternational Journal of Refractory Metals and Hard Materials, 2015
- Trends in the P/M hard metal industryInternational Journal of Refractory Metals and Hard Materials, 2015
- Characterization of WC–(W,V)C–Co made from pre-alloyed (W,V)CInternational Journal of Refractory Metals and Hard Materials, 2009
- Properties of NbC–Co cermets obtained by spark plasma sinteringMaterials Letters, 2007
- Ti(C,N) cermets — Metallurgy and propertiesInternational Journal of Refractory Metals and Hard Materials, 1995
- Solid state properties of group IVb carbonitridesJournal of Alloys and Compounds, 1995
- Hardmetals and CermetsAnnual Review of Materials Science, 1989