High-current pulsed electron-beam (HCPEB) surface modification of Al-Co-Cr-Fe-Ni high-entropy alloy (wt. %) Al—15.64; Co—7.78; Cr—8.87; Fe—22.31; Ni—44.57, fabricated via wire-arc additive manufacturing was studied. The initial condition of the sample is characterized by a highly inhomogeneous distribution of the chemical elements that form the alloy. The alloy samples were irradiated with the different electron beam energy densities of 10, 20 and 30 J/cm². The surface structure was then analyzed in relation to an energy deposition mode. The study has established that HCPEB induces a high-speed crystallization structure with cells varying in size from 100 to 200 nm. There are nano-dimensional (15–30 nm) second-phase inclusions enriched with atoms of Cr and Fe along the grain boundaries. The most liquating elements are Cr and Al. Electron beam surface modification of the high-entropy alloy induces its homogenization. The study has highlighted that the mode of 20 J/cm², 50 µs, 3 pulses, 0.3 s⁻¹ results in the formation of a surface layer with the most homogenously distributed chemical elements.

中文翻译：

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脉冲电子束辐照 AlCoCrFeNi 高熵合金的结构演变

Al-Co-Cr-Fe-Ni高熵合金(wt. %)Al—15.64的大电流脉冲电子束(HCPEB)表面改性；Co—7.78；Cr—8.87；Fe—22.31；Ni—44.57，通过线弧增材制造进行了研究。样品的初始状态的特征是形成合金的化学元素分布高度不均匀。用10、20和30 J/cm ²的不同电子束能量密度辐照合金样品. 然后根据能量沉积模式分析表面结构。该研究已经确定，HCPEB 诱导高速结晶结构，细胞大小从 100 到 200 纳米不等。沿晶界存在富含 Cr 和 Fe 原子的纳米级 (15-30 nm) 第二相夹杂物。最易液化的元素是 Cr 和 Al。高熵合金的电子束表面改性诱导其均匀化。该研究强调，20 J/cm ²、50 µs、3 个脉冲、0.3 s ^{-1 的模式}导致形成具有最均匀分布的化学元素的表面层。