Irradiation-induced embrittlement is a critical and common issue for nuclear materials. Here, we find that the structural design of high-entropy alloy (HEA), nanochannel Al_0.1CoCrFeNi HEA, not only enhances the irradiation tolerance, but also significantly relieves the irradiation-induced embrittlement. We present a systematic investigation on the irradiation tolerance and the mechanical response of the nanochannel HEA irradiated by 40 keV He⁺ ions to the fluence of 5×10¹⁷ ions/cm² and by 2 MeV Ar⁺ ions to a fluence of 6×10¹⁶ ions/cm². It is uncovered that the nanochannel HEA exhibits better He management ability and radiation damage tolerance than its dense counterpart. Furthermore, nanoindentation tests show that the irradiated nanochannel HEA has a better mechanical response compared with its dense counterpart: (1) Strain rate sensitivity (SRS) exponent (m) of the nanochannel HEA has only a slight decrease compared to the large decrease for the dense HEA; and (2) the SRS exponent (m) of the nanochannel HEA is elevated while that of the dense HEA is consistently decrease after He⁺ ion irradiation. These results highlight that nanochannel structure with enormous free surface can mitigate the deleterious effects of irradiation as comparing with its dense counterpart, and represents a new promising strategy to design radiation tolerant materials for the advanced nuclear reactor systems.

辐照引起的脆化是核材料的一个关键和常见问题。在这里，我们发现高熵合金 (HEA)、纳米通道 Al _0.1 CoCrFeNi HEA 的结构设计不仅提高了辐照耐受性，而且显着缓解了辐照引起的脆化。 我们对 40 keV He ⁺离子照射到 5×10 ¹⁷ 离子/cm ²和 2  MeV Ar ⁺离子照射到 6×10 的注量的纳米通道 HEA 的耐辐照性和机械响应进行了系统研究^{16 个} 离子/cm ². 据发现，纳米通道 HEA 表现出比其致密对应物更好的 He 管理能力和辐射损伤耐受性。此外，纳米压痕测试表明，与致密对应物相比，经辐照的纳米通道 HEA 具有更好的机械响应：(1) 纳米通道 HEA 的应变率灵敏度 (SRS) 指数 ( m ) 与致密的HEA；(2) 纳米通道 HEA 的 SRS 指数 ( m ) 升高，而致密 HEA 的 SRS 指数在 He ^{+后持续下降}离子辐照。这些结果突出表明，与其致密对应物相比，具有巨大自由表面的纳米通道结构可以减轻辐射的有害影响，并且代表了为先进核反应堆系统设计耐辐射材料的新的有前途的策略。