The probable formation mechanism of He bubble superlattices relies on long range anisotropic diffusion of self-interstitial atoms (SIAs). Here we study He ion irradiation of pure Ni and two equiatomic concentrated solid-solution alloys (CSAs) of FeNi and FeCrNiCo. It is expected from the significantly reduced diffusion of SIAs in CSAs, including high entropy alloys (HEAs), that long range anisotropic SIA migration cannot be active. We report the formation of a He bubble lattice in pure Ni, and for the first time in FeNi and FeCrNiCo systems under 30 keV He ion irradiation at room temperature. The ion dose and flux required to form a bubble superlattice increase with chemical complexity. Comparing to Ni, SIA clusters change directions more frequently due to anisotropic elementally-biased diffusion from the higher degree of chemical non-homogeneity in CSAs. Nevertheless, anisotropic 1-D diffusion of interstitial defects is possible in these complex alloys over incrementally longer time scales and irradiation doses. The sluggish diffusion, characteristic in CSAs, leads to smaller superlattice parameters and smaller bubble diameters. The chemical biased SIA diffusion and its effects on He evolution revealed here have important implications on understanding and improving radiation tolerance over a wide range of extreme conditions.

He气泡超晶格的可能形成机理取决于自填隙原子（SIAs）的长距离各向异性扩散。在这里，我们研究纯Ni和两种等原子的FeNi和FeCrNiCo的浓固溶体合金（CSAs）的He离子辐射。从SIA在CSA中（包括高熵合金（HEA））中的扩散显着减少，可以预料到，各向异性SIA的长距离迁移将不活跃。我们报道了在纯镍中形成的He气泡晶格，并且首次在室温下30 keV He离子辐照下在FeNi和FeCrNiCo系统中形成了He气泡晶格。形成气泡超晶格所需的离子剂量和通量随着化学复杂性的增加而增加。比起Ni 由于CSA中较高程度的化学非均一性，各向异性元素偏向的扩散使SIA簇更频繁地改变方向。然而，在这些复杂的合金中，随着时间的延长和辐照剂量的增加，间隙缺陷的各向异性一维扩散是可能的。CSA的特征是缓慢的扩散，导致较小的超晶格参数和较小的气泡直径。本文揭示的化学偏压的SIA扩散及其对He演化的影响对于理解和提高在各种极端条件下的辐射耐受性具有重要意义。导致较小的超晶格参数和较小的气泡直径。本文揭示的化学偏压的SIA扩散及其对He演化的影响对于理解和提高在各种极端条件下的辐射耐受性具有重要意义。导致较小的超晶格参数和较小的气泡直径。本文揭示的化学偏压的SIA扩散及其对He演化的影响对于理解和提高在各种极端条件下的辐射耐受性具有重要意义。