U-Mo金属型核燃料因为其高铀含量和高热导率等优点,被认为是一种有潜力的新型核燃料,其辐照肿胀行为尚需进行深入研究。本文通过分子动力学模拟研究了γ-U-Mo合金中的位移级联。详细分析了级联过程。评估了初级离位原子(PKA)的初始方向和PKA能量对最终损伤状态的影响。结果表明,PKA的方向对最终的初级损伤状态没有影响。大多数缺陷团簇的大小不超过3,随着PKA能量的增加,产生较大间隙团簇和空位团簇的概率也会增加。尺寸大于3的团簇中的Mo间隙原子和孤立的Mo间隙原子所占的比例很低。The irradiated swelling behavior of U-Mo metal-based nuclear fuel, which is considered as a potential new nuclear fuel because of its high uranium content and high thermal conductivity, has yet to be studied in depth. In this paper, displacement cascades in γ-U-Mo alloys are investigated by molecular dynamics simulations. The cascade process is analyzed in detail. The effects of the initial orientation of the primary delocalized atoms (PKA) and the PKA energy on the final damage state were evaluated. The results show that the orientation of PKA has no effect on the final primary damage state. The size of most defect clusters does not exceed 3, and the probability of producing larger gap clusters and vacancy clusters increases with increasing PKA energy. The proportion of Mo interstitial atoms and isolated Mo interstitial atoms in clusters with sizes larger than 3 is low.
