Abstract
A WC-based cermet bonded by high-entropy-alloy CoFeNiCr was successfully fabricated by spark plasma sintering. The densification behavior, phase constitution, microstructure and mechanical properties of WC-CoFeNiCr/Co composites were investigated. After 5 minutes sintering at 1200 °C, the high-entropy-alloy CoFeNiCr binder retains an fcc structure without reacting with WC, and the WC-CoFeNiCr specimens show dense microstructure. At room temperature, the WC-10 wt pct CoFeNiCr specimen possesses hardness and fracture toughness of HV30 18.95 GPa and 15.88 MPa·m1/2, which are 11.6 and 7.6 pct higher than those of the WC-10 wt pct Co specimen. Especially at 600 °C, the WC-CoFeNiCr specimen has superior hardness, which is 29 pct higher than that of the WC-Co. The high softening resistance of the WC-CoFeNiCr composite at elevated temperature should be mainly attributable to the diffusion retardation of the CoCrFeNi binder.
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Acknowledgments
This topic of research was financed by Joint Funds of Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110956), Guangdong Ordinary Universities Youth Innovative Talents Project (No. 2020KQNCX085), the Scientific Research Foundation of Advanced Talents (Innovation Team) (DGUT, No. KCYCXPT2016004) and Zhongshi Metal Limited-liability Company Doctor Workstation [DGUT, No. 186100030019 (GC200104-42)].
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Zheng, D. High-Entropy-Alloy CoFeNiCr Bonded WC-Based Cemented Carbide Prepared by Spark Plasma Sintering. Metall Mater Trans A 53, 2724–2729 (2022). https://doi.org/10.1007/s11661-022-06701-6
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DOI: https://doi.org/10.1007/s11661-022-06701-6