The National Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, China
Abstract：AlxCrFeCoNi (x=0.5, 1) high entropy alloy powder was prepared by gas atomization, and mixed with WC powder by high-energy ball milling to obtain WC-AlxCrFeCoNi composite powders. The WC-AlxCrFeCoNi composite was prepared by hot pressing sintering. The microstructure, mechanical properties and corrosion behavior of the sintered samples were studied by X-ray diffraction, scanning electron microscopy, Vickers hardness and electrochemical corrosion test. The results show that replacing Co with AlxCrFeCoNi high entropy alloy as bonding phase can inhibit WC grain growth and refine grain size. The WC-AlxCrFeCoNi has higher hardness and better fracture toughness than traditional WC-10Co cemented carbide. Among them, the WC-10AlCrFeCoNi alloy has the highest hardness of 20.3 GPa, while the WC-10Al0.5CrFeCoNi alloy has the maximum fracture toughness of 12.0 MPa·m1/2. WC-10AlxCrFeCoNi composite has better corrosion resistance than WC-10Co traditional cemented carbide.
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2019, Vol. 24 
