Abstract

The WC/CoCrFeNiAl_0.2 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 CoCrFeNiAl_0.2 HEA was fabricated using low-cost metal oxides. The molten HEA was subsequently infiltrated into the WC layer to fabricate WC/CoCrFeNiAl_0.2 composites in a high-gravity field. The porosity of the WC/CoCrFeNiAl_0.2 composites was down-regulated, and their compressive yield strength was up-regulated when the high-gravity field was increased from 600g to 1500g 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 from 9.53 to 7.41 GPa along the direction of the centrifugal force.

中文翻译：

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高重力燃烧合成法制备WC / CoCrFeNiAl0.2 0.2高熵合金复合材料

摘要

通过高重力燃烧合成制备了WC / CoCrFeNiAl0.2 _0.2高熵合金（HEA）复合材料。制备方法如下。首先，使用设计合适的多相铝热剂系统，使用低成本金属氧化物制造熔融的CoCrFeNiAl _0.2 HEA。将熔融HEA随后渗入WC层以制造WC / CoCrFeNiAl _0.2复合材料在高重力场。WC / CoCrFeNiAlAl的孔隙率_0.2当高重力场从600g增加到1500g时，复合材料被下调，抗压屈服强度被上调，这是因为HEA熔体向WC层的渗透过程是由离心力驱动的。复合材料中的WC颗粒沿离心力方向表现出梯度分布，这归因于高重力场和温度梯度场的共同作用。样品的维氏硬度沿离心力的方向从9.53 GPa下调至7.41 GPa。