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首页> 外文期刊>Metallurgical and Materials Transactions A >Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)
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Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

机译：U-Mo合金与Al扩散对在873 K（600°C）退火后形成的相互作用层的相成分和微观结构

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摘要

U-Mo dispersion and monolithic fuels are being developed to fulfill the requirements for research reactors, under the Reduced Enrichment for Research and Test Reactors program. In dispersion fuels, particles of U-Mo alloys are embedded in the Al-alloy matrix, while in monolithic fuels, U-Mo monoliths are roll bonded to the Al-alloy matrix. In this study, interdiffusion and microstructural development in the solid-to-solid diffusion couples, namely, U-15.7 at. pct Mo (7 wt pct Mo) vs pure Al, U-21.6 at. pct Mo (10 wt pct Mo) vs pure Al, and U-25.3 at. pct Mo (12 wt pct Mo) vs pure Al, annealed at 873 K (600 °C) for 24 hours, were examined in detail. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron probe microanalysis (EPMA) were employed to examine the development of a very fine multiphase interaction layer with an approximately constant average composition of 80 at. pct Al. Extensive TEM was carried out to identify the constituent phases across the interaction layer based on selected area electron diffraction and convergent beam electron diffraction (CBED). The cubic-UAl3, orthorhombic-UAl4, hexagonal-U6Mo4Al43, and cubic-UMo2Al20 phases were identified within the interaction layer that included two- and three-phase layers. Residual stress from large differences in molar volume, evidenced by vertical cracks within the interaction layer, high Al mobility, Mo supersaturation, and partitioning toward equilibrium in the interdiffusion zone were employed to describe the complex microstructure and phase constituents observed. A mechanism by compositional modification of the Al alloy is explored to mitigate the development of the U6Mo4Al43 phase, which exhibits poor irradiation behavior that includes void formation and swelling.
机译：根据“减少研究和试验堆的富集”计划，正在开发U-Mo分散体和整体式燃料，以满足研究堆的要求。在分散燃料中，U-Mo合金颗粒被嵌入铝合金基体中，而在整体式燃料中，U-Mo整体块被辊压结合到铝合金基体上。在这项研究中，固-固扩散对中的相互扩散和微观结构发展，即U-15.7 at。 pct Mo（7 wt pct Mo）与纯Al，U-21.6 at。 pct Mo（10 wt pct Mo）与纯Al和U-25.3 at。详细检查了在873 K（600°C）下退火24小时的pct Mo（12 wt pct Mo）与纯Al的关系。扫描电子显微镜（SEM），透射电子显微镜（TEM）和电子探针显微分析（EPMA）被用来检查非常细的多相相互作用层的发展，其平均常数约为80at。铝进行了广泛的TEM，以基于选定区域电子衍射和会聚束电子衍射（CBED）识别相互作用层上的组成相。立方UAl 3 ，正交UAl 4 ，六方U 6 Mo 4 Al 43 和cubic-UMo 2 Al 20 相在包含两相和三相层的相互作用层中被确定。来自摩尔体积差异大的残余应力，由相互作用层内的垂直裂纹，高的Al迁移率，Mo过饱和和互扩散区中的平衡分配所证明，用于描述观察到的复杂的微观结构和相组成。探索了铝合金成分改性的机理，以减轻辐照不良的U 6 Mo 4 Al 43 相的发展。包括空洞形成和膨胀的行为。

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