Studies were completed to obtain tensile mechanical properties for uranium-10 wt.% molybdenum (U10Mo) foils which were subjected to four different thermomechanical processing conditions. UMo alloy foils are being investigated to support fuel conversion of high power research reactors from their current high enriched fuel form to a low enriched fuel form. Mechanical properties of the fuel foil have an effect on irradiation performance and fuel fabrication and therefore are required to support modeling and qualification of new low-enriched uranium monolithic fuel plate designs. The data contained in this document contributes to fuel qualification by fulfilling the requirement that physical properties related to fuel meat be established. It is expected that depleted uranium-10 wt% Mo (DU–10Mo) mechanical behavior is representative of the low-enriched U10Mo to be used in actual fuel plates; therefore DU–10Mo was studied to simplify material processing, handling, and testing requirements. In this report, the different thermomechanical treatments included variations of wrought hot and cold rolling reduction and post rolling annealing. Each of the four foils was hot rolled. After hot rolling reduction, three of the four foils were further reduced by cold rolling. One of the three was reduced a further 20% by cold rolling, and the remaining two were reduced 50% by cold rolling. Following cold rolling reduction, one of the two foils which had been reduced 50% by cold rolling was annealed at 650 °C. Performing this analysis allows assessment of the impact of foil fabrication history on the resultant tensile properties DU–10Mo fuel foils.

Tensile properties of DU–10Mo at room temperature through approximately 400 °C determined from the tests conducted herein suggest the material is stronger and has lower ductility than what has been reported previously in the literature. The explanation for these differences has yet to be determined, but is likely related to differences in grain size and/or impurity content, and variation in fabrication history. At the highest temperatures tested (550 °C) better agreement between the values reported here and available literature was found. As expected, yield and ultimate tensile strength decreased with increasing test temperature. Generally, the yield stress for all foil processing conditions was found to be in the range of 1100 MPa for room temperature tests, and in the range of 200 MPa for tests conducted at 550 °C. Ultimate tensile stress was in the range of 1175 MPa at room temperature, decreasing to approximately 225 MPa at 550 °C. Elongation increased significantly, from 0 to 2% at room temperature to 50% or more for the tests at 550 °C.

完成研究以获得10％（重量）的铀（U 10Mo）箔的拉伸机械性能，这些箔经受了四种不同的热机械加工条件。ü钼合金箔正在研究中，以支持高功率研究堆从当前的高浓燃料形式向低浓燃料形式的燃料转化。燃料箔的机械性能会影响辐照性能和燃料制造，因此需要支持新的低浓铀整体式燃料板设计的建模和鉴定。本文档中包含的数据通过满足建立与燃料肉相关的物理特性的要求，有助于燃料鉴定。预计贫铀10 wt％Mo（DU–10Mo）的力学行为可代表低浓铀10Mo用于实际的燃料板；因此，对DU-10Mo进行了研究，以简化材料加工，处理和测试要求。在此报告中，不同的热机械处理方法包括变形的热轧和冷轧压下率以及后轧制退火。四个箔中的每一个都被热轧。热轧压下后，通过冷轧进一步还原四个箔中的三个。三者之一通过冷轧进一步降低了20％，其余两者通过冷轧降低了50％。冷轧压下后，将通过冷轧压下50％的两个箔之一在650℃下退火。执行此分析可以评估箔片制造历史对最终的DU-10Mo燃料箔片拉伸性能的影响。

根据本文进行的测试确定，DU–10Mo在室温至约400°C的温度下的拉伸性能表明，该材料比以前的文献报道的材料更坚固且延展性更低。这些差异的解释尚待确定，但可能与晶粒尺寸和/或杂质含量的差异以及制造历史的差异有关。在测试的最高温度（550°C）下，发现此处报告的值与现有文献之间的一致性更好。如预期的那样，屈服强度和极限抗拉强度会随着测试温度的升高而降低。通常，对于所有箔片加工条件，对于室温测试，发现屈服应力在1100 MPa的范围内，对于在550°C下进行的测试，屈服应力在200 MPa的范围内。室温下的极限拉伸应力在1175 MPa的范围内，在550°C时降低到约225 MPa。伸长率显着增加，从室温的0％增至2％，到550°C的测试伸长率达到50％或更高。