Fabrication and Characterization of WC-AlCoCrCuFeNi High-entropy Alloy Composites by Spark Plasma Sintering
Mechanically alloyed AlCoCrCuFeNi high-entropy alloy(HEA)powders were used as binder to fabricate WC/HEA composites by spark plasma sintering.The effects of sintering temperature,duration time and binder content on microstructures and mechanical properties were studied.Compared with cobalt binder,the HEA binder has an advantage on the inhibition of WC grain growth due to the sluggish diffusion effect,and the average WC grain size decreases with increasing HEA binder content.Furthermore,the fracture toughness of WC/HEA composites firstly increases with increasing Vickers hardness and then decreases.A good comprehensive mechanical property was obtained after sintering at 1250 ℃ for 5 min with 10 wt.%HEA binder under a sintering pressure of 30 MPa.The Vickers hardness is 1922 HV30 and the fracture toughness is 10.41 MPa·m1/2,which are higher than those of commercial WC/Co composites.Therefore,the AlCoCrCuFeNi high-entropy alloy has a potential to be a binder for WC.
tungsten carbide high-entropy alloy binder spark plasma sintering microstructures mechanical properties
Luo Wenyan Liu Yunzhong Luo Yang Wu Min
National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China
国际会议
北京
英文
848-857
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）