Microstructure and Mechanical Properties of WC-AlCoCrFeNiTi_0.8Cemented Carbide AITranslate

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Chinese Library Classification Number:TG146.41[金属学及工艺—金属材料]

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WC-AlCoCrFeNiTi_0.8cemented carbide was prepared by vacuum sintering method using mechanically alloyed AlCoCrFeNiTi_0.8high-entropy alloy powder as binder phase,and the effects of sintering temperature and binder phase content on the microstructure and mechanical properties of the cemented carbide were investigated.The results show that the grain size of WC-AlCoCrFeNiTi_0.8cemented carbide increases with the increase of sintering temperature and decreases with the increase of binder phase content.And a new phase known as the FCC phase appears.As the sintering temperature increases,the hardness and toughness of the cemented carbide increase initially before declining,and the hardness decreases with the increase of binder phase content,with toughness being the opposite.Compared with WC-Co,the binder phase AlCoCrFeNiTi_0.8can inhibit the growth of WC grains due to its slow diffusion effect,and the average WC grain size of WC-AlCoCrFeNiTi_0.8cemented carbide is reduced by 54.36%while the hardness is increased by 23.98%.At the sintering temperature of 1450℃,WC-10AlCoCrFeNiTi_0.8has better comprehensive mechanical properties with a hardness of 1923 HV₃₀and fracture toughness of 9.13 MPa·m^1/2,which are higher than those of commercial WC-Co cemented carbide.