High-entropy alloys (HEAs) are proposed as potential structural materials for advanced nuclear systems, but little is known about the response of matrix chemistry in HEAs upon irradiation. Here, we reveal a substantial change of matrix chemical concentration as a function of irradiation damage (depth) in equiatomic NiCoFeCr HEA irradiated by 3 MeV Ni ions. After ion irradiation, the matrix contains more Fe/Cr in depth shallower than ~900–1000 nm but more Ni/Co from ~900–1000 nm to the end of the ion-damaged region due to the preferential diffusion of vacancies through Fe/Cr. Preferential diffusion also facilitates migration of vacancies from high radiation damage region to low radiation damage region, leading to no void formation below ~900–1000 nm and void formation around the end of the ion-damaged region at a fluence of 5 × 1016 cm−2 (~123 dpa, displacements per atom, peak dose under full cascade mode). As voids grow significantly at an increased fluence (8 × 1016 cm−2, 196 dpa), the matrix concentration does not change dramatically due to new voids formed below ~900–1000 nm.

有人提出高熵合金（HEA）作为先进核系统的潜在结构材料，但对HEA辐照后基体化学的响应知之甚少。在这里，我们揭示了在3 MeV Ni离子辐照的等原子NiCoFeCr HEA中，基质化学浓度随辐照损伤（深度）的变化而变化的情况。离子辐照后，由于空位优先通过Fe /扩散而扩散，基体中的Fe / Cr深度小于〜900–1000 nm，但Ni / Co从〜900–1000 nm到离子损伤区域的末端更多。铬 优先扩散还有利于空位从高辐射损伤区域迁移到低辐射损伤区域，从而导致在约900–1000 nm以下无空洞形成，并且在离子损伤区域末端以5×10的注量形成空洞。16 cm -2（〜123 dpa，每个原子的位移，完全级联模式下的峰值剂量）。作为空隙以增加的通量（8×10显著生长16厘米-2，196 DPA），基质浓度不显着地由于以下〜900-1000纳米形成新的空隙变化。