Influence of La2O3 doping on microstructure and properties of WC-10AlCoCrFeNi cemented carbides sintered by micro wave
WC-10AlCoCrFeNi cemented carbides doped with La2O3 were prepared by mechanical alloying and microwave sintering.The effect of La2O3 content on phase structure,microstructure and mechanical properties of the WC-10AlCoCrFeNi cemented carbides was studied.The results show that the high entropy alloy powder prepared by mechanical alloying has uniform chemical composition and no obvious enrichment phenomenon.La2O3 can reduce the oxidation degree of Al element,refine grain size,and promote crack deflection and bridging.With the increase of La2O3 content,the grain size of the cemented carbides first increases and then decreases,and the mechanical properties first increase and then decrease.When the content of La2O3 is 0.075 mass％,the microstructure of the cemented carbides is uniform and the performance is the best,the grain size is 0.44 μm,the relative density is 95.81％,the hardness is 1616.57 HV30,the fracture toughness is 13.64 MPa·m1/2,and the bending strength is 1404.05 MPa.
high entropy alloyLa2O3cemented carbidemicrostructuremechanical property
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