Preparation of WC/CoCrFeNiAl0.2 high-entropy-alloy composites by high-gravity combustion synthesis
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第2期
论文作者：Guan-nan Zhang Xiao Yang Zeng-chao Yang Yong Li Gang He Jiang-tao Li
文章页码：244 - 251
摘 要：The WC/CoCrFeNiAl0.2 high-entropy alloy（HEA） composites were prepared through high-gravity combustion synthesis. The preparation method is presented below. First, using a designed suitable multiphase thermite system, the molten CoCrFeNiAl0.2 HEA was fabricated using low-cost metal oxides. The molten HEA was subsequently infiltrated into the WC layer to fabricate WC/CoCrFeNiAl0.2 composites in a highgravity field. The porosity of the WC/CoCrFeNiAl0.2 composites was down-regulated, and their compressive yield strength was up-regulated when the high-gravity field was increased from 600 g to 1500 g because this infiltration process of a HEA melt into the WC layer is driven by centrifugal force. The WC particles in the composites exhibited a gradient distribution along the direction of the centrifugal force, which was attributed to the combined action of the high-gravity field and the temperature gradient field. The Vickers hardness of the sample was down-regulated from9.53 to 7.41 GPa along the direction of the centrifugal force.
Guan-nan Zhang1,2，Xiao Yang1，Zeng-chao Yang1，Yong Li1，Gang He1，Jiang-tao Li1
1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences
摘 要：The WC/CoCrFeNiAl0.2 high-entropy alloy（HEA） composites were prepared through high-gravity combustion synthesis. The preparation method is presented below. First, using a designed suitable multiphase thermite system, the molten CoCrFeNiAl0.2 HEA was fabricated using low-cost metal oxides. The molten HEA was subsequently infiltrated into the WC layer to fabricate WC/CoCrFeNiAl0.2 composites in a highgravity field. The porosity of the WC/CoCrFeNiAl0.2 composites was down-regulated, and their compressive yield strength was up-regulated when the high-gravity field was increased from 600 g to 1500 g because this infiltration process of a HEA melt into the WC layer is driven by centrifugal force. The WC particles in the composites exhibited a gradient distribution along the direction of the centrifugal force, which was attributed to the combined action of the high-gravity field and the temperature gradient field. The Vickers hardness of the sample was down-regulated from9.53 to 7.41 GPa along the direction of the centrifugal force.
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