U₃Si₂ and U₃Si₅ are two important uranium silicide phases currently under extensive investigation as potential fuel forms or components for light water reactors (LWRs) to enhance accident tolerance. In this paper, their irradiation behaviors are studied by ion beam irradiations with various ion mass and energies, and their microstructure evolution is investigated by in-situ transmission electron microscopy (TEM). U₃Si₂ can easily be amorphized by ion beam irradiations (by 1 MeV Ar²⁺ or Kr²⁺) at room temperature with the critical amorphization dose less than 1 dpa. The critical amorphization temperatures of U₃Si₂ irradiated by 1 MeV Kr²⁺ and 1 MeV Ar²⁺ ion are determined as 580 ± 10 K and 540 ± 5 K, respectively. In contrast, U₃Si₅ remains crystalline up to 8 dpa at room temperature and is stable against ion irradiation-induced amorphization up to ∼50 dpa by either 1 MeV Kr²⁺ or 150 KeV Kr⁺ at 623 K. These results provide valuable experimental data to guide future irradiation experiments, support the relevant post irradiation examination, and serve as the experimental basis for the validation of advanced fuel performance models.

U ₃ Si ₂和U ₃ Si ₅是两个重要的硅化铀重要相，目前正作为轻水反应堆（LWR）的潜在燃料形式或组分，以提高事故承受能力，正在对其进行广泛研究。在本文中，通过各种离子质量和能量的离子束辐照研究了它们的辐照行为，并通过原位透射电子显微镜（TEM）研究了它们的微观结构演变。U ₃ Si ₂可以通过离子束辐照（通过1 MeV Ar ²⁺或Kr ²⁺）在室温下且临界非晶化剂量小于1 dpa。1 MeV Kr ²⁺和1 MeV Ar ²⁺离子辐照的U ₃ Si ₂的临界非晶化温度分别确定为580±10 K和540±5K。相比之下，U ₃ Si ₅在室温下保持高达8 dpa的结晶状态，并且对于1 MeV Kr ²⁺或150 KeV Kr ^+的离子辐照引起的高达50 dpa的非晶化具有稳定作用。 在623 K时。这些结果提供了宝贵的实验数据，可指导未来的辐照实验，支持相关的辐照后检查，并为验证先进燃料性能模型提供实验基础。