Polycrystalline elastic moduli and stiffness tensor components of γ-phase U – 8 wt% Mo have been determined by resonant ultrasound spectroscopy in the temperature range of 25–650 °C. The ambient temperature elastic properties are compared to results measured via other experimental methods and show reasonable agreement, though there is considerable variation of these properties within the literature at both the U – 8 wt% Mo composition and as a function of Mo concentration. The Young's modulus of U – 8 wt% Mo measured in this study decreases steadily with temperature at a rate that is slower than trends previously observed at similar Mo concentrations, though the difference is not statistically significant. This first measurement of the temperature dependent elastic stiffness tensor of a polycrystalline U-Mo alloy clarifies that the behavior of the Young's modulus is due to a strongly weakening C₁₁ polycrystalline stiffness tensor component, along with milder decreases in C₁₂ and C₄₄. The unique partially auxetic properties recently predicted for single-crystalline U-Mo are discussed in regard to their possible impact on the polycrystalline behavior of the alloy.

γ相U – 8 wt％Mo的多晶弹性模量和刚度张量分量是通过共振超声光谱法在25–650°C的温度范围内确定的。将环境温度弹性特性与通过其他实验方法测得的结果进行了比较，并显示出合理的一致性，尽管文献中这些特性在U – 8 wt％Mo组成和Mo浓度的函数之间存在相当大的变化。在这项研究中测得的U – 8 wt％Mo的杨氏模量随温度稳定降低，其速率比以前在相似Mo浓度下观察到的趋势要慢，尽管差异在统计学上并不显着。₁₁多晶刚度张量分量，以及C ₁₂和C _44的轻度下降。关于单晶U-Mo对合金多晶行为的可能影响，讨论了最近预测的独特的部分膨胀特性。