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A new method for preparing high entropy alloys: Electromagnetic pulse treatment and its effects on mechanical and corrosion properties

机译：一种制备高熵合金的新方法：电磁脉冲处理及其对机械和腐蚀性能的影响

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摘要

Electromagnetic pulse CEMP) treatment was firstly applied during the preparation process of CoCrFeNiCu high entropy alloy (HEA) and its mechanism was illustrated. The crystal structure, microstructure, mechanical properties, and corrosion properties of CoCrFeNiCu HEAs in current and magnetizing directions with different EMP frequencies were characterized. The results demonstrated that EMP can significantly influence the lattice parameter, microstructure, enhance mechanical and alter corrosion properties. When EMP applied, the dendrite arms were severely coarsened and the microstructure changed from typical dendrite to quasi-equiaxed morphology. The hardness and yield strength were increased by 18% and 23%, respectively. Meanwhile, corrosion current density decreased from 5.4 μA cm~(-2) to 1.4 μA cm~(-2). Anisotropy effect was revealed between the current and magnetizing directions in the same ingot, which is seldom reported before. The gap of interplanar distances, mechanical properties and corrosion properties between these two perpendicular directions became smaller and close to each other with increasing EMP frequency.
机译：首先在CoCrFeNiCu高熵合金（HEA）的制备过程中进行了电磁脉冲CEMP）处理，并说明了其机理。表征了CoCrFeNiCu HEA在不同的EMP频率下在电流和磁化方向上的晶体结构，微观结构，力学性能和腐蚀性能。结果表明，EMP可以显着影响晶格参数，微观结构，增强机械性能并改变腐蚀性能。当应用EMP时，枝晶臂被严重粗化，并且微观结构从典型的枝晶变为准等位形态。硬度和屈服强度分别提高了18％和23％。同时，腐蚀电流密度从5.4μAcm〜（-2）降低到1.4μAcm〜（-2）。以前很少报道过在同一铸锭中的电流方向和磁化方向之间存在各向异性效应。随着EMP频率的增加，这两个垂直方向之间的面间距，机械性能和腐蚀性能之间的差距变得越来越小，并且彼此接近。

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