A high-energy Xe ion irradiation experiment was conducted to investigate the temperature dependence of interdiffusion in bilayer Al-UMo samples under irradiation. The amount of interdiffusion achieved at a fixed dose with the increase of temperature showed a clear transition at 175°C (with an estimated error in the range of ±10°C) from temperature-independent to temperature-dependent behavior. The activation energy derived from the curve of interdiffusion quantity vs. irradiation temperature is 0.77±0.16 eV. This information has been utilized to understand the temperature effect on the interdiffusion process that occurred at the interfaces of U-Mo particles and the Al matrix in U-Mo/Al dispersion fuels, whose magnitude significantly impacts the fuel's performance. Although this temperature effect was deemed important, it cannot be examined directly using in-pile irradiation data, as fuel temperatures cannot be measured in reactor irradiation and are highly correlated with fission rate and thermal conductivity evolution. To connect the knowledge accumulated from ion irradiation with in-pile irradiation data, simulation of a full-sized U-Mo/Al dispersion fuel plate irradiated in the FUTURE test in the BR2 reactor was performed with the Dispersion Analysis Research Tool (DART), a dispersion fuel performance code. DART is equipped with an interaction or interdiffusion layer (IL) growth correlation formulated to describe the temperature dependence of ion mixing results. The agreement between calculated and measured fuel meat constituent volume fractions and swelling data demonstrated that the temperature effect on in-pile Al-UMo interdiffusion is well captured with the correlation. In this case, the fitted activation energy is 0.70 eV. Considering the uncertainties associated with the ion irradiation data, the activation energy obtained from in-pile data fitting is in accord with that from ion irradiation results.

进行了高能Xe离子辐照实验，以研究双层Al-UMo样品在辐照下相互扩散的温度依赖性。在固定剂量下，随着温度的升高，相互扩散的量在175°C（估计误差在±10°C范围内）中从温度无关行为转变为温度依赖性行为。由相互扩散量与照射温度的关系曲线得出的活化能为0.77±0.16 eV。该信息已被用来了解温度对U-Mo / Al分散燃料中U-Mo颗粒与Al基体界面的互扩散过程的影响，其大小会严重影响燃料的性能。尽管这种温度效应被认为很重要，由于无法在反应堆辐照中测量燃料温度，并且与裂变率和导热系数的变化高度相关，因此无法直接使用堆内辐照数据来检查燃料温度。为了将离子辐照积累的知识与堆内辐照数据联系起来，使用弥散分析研究工具（DART）对在BR2反应堆的FUTURE试验中辐照的全尺寸U-Mo / Al弥散燃料板进行了仿真，分散燃料性能规范。DART配备了相互作用层或互扩散层（IL）生长相关性，用于描述离子混合结果的温度依赖性。计算和测量的燃料肉成分体积分数与溶胀数据之间的一致性表明，通过相关性可以很好地捕获温度对桩内Al-UMo相互扩散的影响。在这种情况下，拟合的活化能为0.70 eV。考虑到与离子辐照数据相关的不确定性，从桩内数据拟合获得的活化能与从离子辐照结果得到的活化能一致。