Study on Microstructure and Mechanical Properties of WC-10CoCrFeMnNi High-Entropy Cemented Carbide
CoCrFeMnNi high-entropy alloy powder with equal molar ratio was prepared by mechanical allo-ying,and WC-10CoCrFeMnNi cemented carbide was prepared by spark plasma sintering.The microstruc-ture and properties of high-entropy alloy powder and cemented carbide were studied by X-ray diffractome-ter,scanning electron microscope,energy dispersive spectrometer,Vickers hardness tester,and laser parti-cle size analyzer.The results show that the nanocrystalline CoCrFeMnNi high-entropy alloy powder,with BCC as the main phase and FCC as the secondary phase,can be obtained by 80 h of ball milling.The ave-rage particle size is 1.4 μm,and the particle size distribution is relatively centralized.The cemented car-bide,using CoCrFeMnNi high-entropy alloy as the binder phase,exhibits excellent mechanical properties.And the cemented carbide sintered at 1 250 ℃ has better comprehensive mechanical properties,with a Vickers hardness of(1 452±18.95)HV30 and a fracture toughness of(8.57±0.32)MPa·m1/2.
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