热压法制备超细晶WC-Al<em><sub>x</sub></em>CrFeCoNi复合材料及其组织与性能

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Abstract Al_xCrFeCoNi (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-Al_xCrFeCoNi composite powders. The WC-Al_xCrFeCoNi 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 Al_xCrFeCoNi high entropy alloy as bonding phase can inhibit WC grain growth and refine grain size. The WC-Al_xCrFeCoNi 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-10Al_0.5CrFeCoNi alloy has the maximum fracture toughness of 12.0 MPa·m^1/2. WC-10Al_xCrFeCoNi composite has better corrosion resistance than WC-10Co traditional cemented carbide.

Key words： cemnted carbide high-entropy alloy (HEA) microstructure mechanical properties

Received: 20 September 2018 Published: 12 July 2019

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TG410.704

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	ZHOU Panlong
	XIAO Daihong
	ZHOU Pengfei
	YU Yongxin
	YUAN Minhui

Cite this article:

ZHOU Panlong,XIAO Daihong,ZHOU Pengfei, et al. Microstructure and properties of ultrafine-grained WC-Al_xCrFeCoNi composites prepared by hot pressing[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 100-105.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I2/100

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