In this study, the alloys used contained Co, Cr, Fe, Ni, and V as the primary elements, while 6%–10% Cu was used as the added element. The high-entropy alloys (HEAs) were made in an electric-arc vacuum furnace from which specimens in the form of cylinders with a 5-mm diameter and 5-mm length were fabricated. An XRD analysis revealed that alloys with 6% and 8% Cu had a single-phase FCC structure, and a weak BCC peak only appeared in the (110) direction in alloys with 10% Cu. A universal testing machine was used for testing at the strain rates of $1\times 10^{-1}$$$s${}^{-1}$, $1\times 10^{-2}$$$s${}^{-1}$, and $1\times 10^{-3}$$$s${}^{-1}$, and the high strain rate was tested using a split Hopkinson pressure bar (SHPB) under strain at 3000$$s${}^{-1}$, 4000$$s${}^{-1}$, and 5000$$s${}^{-1}$, respectively. The specimens did not fracture during the quasi-static compression and dynamic impact tests, which displayed better ductility. The surface of the three alloys had extensive dendrites and non-equiaxed crystal structures. In an EDS composition analysis, the Cr and V elements were more frequently observed in the intergranular region than in the interdendritic region.

本研究所用合金以Co、Cr、Fe、Ni、V为主要元素，同时添加6%~10%的Cu。高熵合金 (HEA) 在电弧真空炉中制造，并制成直径 5 毫米、长度 5 毫米的圆柱体样品。 XRD分析表明，Cu含量为6%和8%的合金具有单相FCC结构，Cu含量为10%的合金仅在（110）方向出现弱BCC峰。使用万能试验机在应变速率为$1\times 10^{-1}$$$s${}^{-1}$,$1\times 10^{-2}$$$s${}^{-1}$， 和$1\times 10^{-3}$$$s${}^{-1}$，并使用分体式霍普金森压力棒 (SHPB) 在 3000 的应变下测试高应变率$$s${}^{-1}$, 4000$$s${}^{-1}$和 5000$$s${}^{-1}$， 分别。试件在准静态压缩和动态冲击试验中均未发生断裂，表现出较好的延展性。三种合金的表面均具有广泛的枝晶和非等轴晶体结构。在 EDS 成分分析中，Cr 和 V 元素在晶间区域比在枝晶间区域更常见。