Abstract The stability of the structure and composition of the alloy is important in structural materials. Therefore, in this study, the distribution of each element in the CoCrFeMnNi equiatomic high-entropy alloy (HEA), which is considered to have a random distribution, was examined experimentally and theoretically. Furthermore, the effect of ion irradiation at different temperatures on the distribution of each element was investigated. The experimental results based on the positron annihilation spectroscopy showed that there was not significant element segregation in the well-annealed CoCrFeMnNi HEA. Moreover, the distribution of the elements in CoCrFeMnNi HEA was approximately the same despite the alloy being irradiated to 0.5 dpa (displacement per atom) at the damage peak at temperatures of 300, 573, and 773 K. In addition, the randomness of the element distribution in the equilibrium structure of the CoCrFeMnNi HEA was investigated using the first-principles simulation. The calculation results showed that despite the favorable affinity between Ni and Cr in the CoCrFeMnNi HEA, the constituent elements in the alloy were disordered. In addition, the same-type atomic pairings of an element with itself, especially Cr-Cr, were all depleted.

中文翻译：

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辐照对CoCrFeMnNi等原子高熵合金元素分布随机性的影响

摘要 合金结构和成分的稳定性在结构材料中很重要。因此，在本研究中，通过实验和理论研究了被认为具有随机分布的 CoCrFeMnNi 等原子高熵合金 (HEA) 中每种元素的分布。此外，研究了不同温度下离子辐照对每种元素分布的影响。基于正电子湮没光谱的实验结果表明，在良好退火的 CoCrFeMnNi HEA 中没有明显的元素偏析。此外，尽管合金在 300、573 和 773 K 的损伤峰值处被辐照至 0.5 dpa（每个原子的位移），但 CoCrFeMnNi HEA 中元素的分布大致相同。此外，使用第一性原理模拟研究了 CoCrFeMnNi HEA 平衡结构中元素分布的随机性。计算结果表明，尽管 CoCrFeMnNi HEA 中 Ni 和 Cr 之间具有良好的亲和力，但合金中的组成元素是无序的。此外，元素与自身的同类型原子配对，尤其是 Cr-Cr，都被耗尽。