【摘要】 铀钼合金(U-Mo)是目前研究堆、空间堆和特种小型堆等堆用燃料的研究热点。辐照过程中燃料的微观结构会发生一系列改变，这可能影响反应堆运行期间的燃料性能。这些变化主要包括铀钼合金与基体相互作用层的形成、裂变产物的释放(主要是裂变气体的释放)以及高燃耗下铀钼合金晶粒的细化。本文总结了以上变化的主要特点和最新的研究进展。同时，提出了在先进检测技术有了较大发展的今天，对燃料辐照后微观结构变化的研究发展趋势。更多还原

【Abstract】 Currently, uranium molybdenum alloy(U-Mo) is a very popular fuel used in research reactors, space reactors, and small reactors for special purposes. During the irradiation process, the microstructure of the U-Mo fuel will undergo a series of changes, which may affect the fuel performance during reactor operation. These changes mainly include :the formation of the interaction layer between the U-Mo fuel core and the matrix, the release of fission products(mainly the release of fission gas), and the refinement of the grain size for U-Mo fuel with high burnup. This article summarizes the main characteristics of the above changes and the latest research progress for them. At the same time, it also proposed the development trends in the study of microstructural changes after fuel irradiation in today’s world where advanced detection technology has made significant progress.更多还原