The nearly infinite compositional design space of high entropy alloys (HEAs) presents many opportunities to improve performance in extreme environments, particularly for nuclear reactors. The ability of some HEAs to resist high amounts of radiation damage, while well documented, has not yet been fully exploited. We studied the irradiation effect of different ions (Si and Ni) on the microstructure and mechanical properties of the Al_0.5CoCrFeNi alloy at its equilibrium state, and of the individual response of each phase to irradiation. The results show a stronger effect of Si ions and differences in response of the ductile FCC (A1) and brittle ordered BCC (B2) phases towards irradiation. This finding highlights the need to further probe unexplored compositional spaces in HEAs, as further optimization is likely to yield further compositional and microstructural stability with practical applications.

高熵合金（HEA）几乎无限的成分设计空间为改善在极端环境（尤其是核反应堆）中的性能提供了许多机会。一些HEA抵抗大量辐射损伤的能力，虽然有据可查，但尚未得到充分利用。我们研究了不同离子（Si和Ni）对Al _0.5的组织和力学性能的辐照效果CoCrFeNi合金处于平衡状态，并且每个相对辐照的响应不同。结果表明，Si离子的作用更强，并且延展性FCC（A1）和脆性有序BCC（B2）相对辐射的响应有所不同。这一发现突出表明，需要进一步探查HEA中未探索的成分空间，因为进一步的优化可能会在实际应用中产生进一步的成分和微观结构稳定性。