U-10wt%Mo合金与LT24Al的反应层性质研究  

Study on Characterization of Interaction Layer between U-10wt%Mo Alloy and LT24 Al

作　　者：陈建刚[1] 尹昌耕[1] 孙长龙[1] 庞晓轩[1] 刘云明[1] 

机构地区：[1]中国核动力研究设计院核燃料及材料国家级重点实验室,成都610041

出　　处：《核动力工程》2009年第5期44-47,共4页Nuclear Power Engineering

摘　　要：对U-10wt%Mo合金和LT24Al合金的反应层性质做了较详细的研究。将U-Mo/Al扩散偶试样在不同条件下进行热压处理,用光学显微镜(OM)和扫描电子显微镜(SEM)分析反应层的厚度,用能谱仪(EDS)分析各元素在反应区内的分布情况,用X射线衍射仪(XRD)测定了反应层的相组成。分析结果表明:U-Mo合金与Al的扩散方式是反应扩散,方向主要为Al原子通过空位扩散向U-Mo合金中迁移;反应层生长动力学表明反应为扩散所控制;U-Mo/Al的单相反应层主要由(U,Mo)Al3组成;两相或多相反应层主要由(U,Mo)Al3和(U,Mo)Al4组成,此外还含有Al20Mo2U;Al中的杂质Si容易在反应层中富集,这种趋势说明Si对改善U-Mo合金和Al的相容性起积极作用。The characterization of interaction layer（IL） between U-10wt%Mo alloy and LT24 Al was studied in detail in this paper. Sandwich structured U-Mo/LT24 Al diffusion couples were hot pressed at different temperature and pressure for different time. Then they were analyzed by Optical Microscope （OM） and Scanning Electron Microscope （SEM） to observe the width of the IL. The distribution of the diffusion elements and the phases in the IL were determined by Energy Dispersive Spectroscopy （EDS） and X Ray Diffraction （XRD）. Analysis results are as follows： the diffusion manner was reaction diffusion, and diffusion direction mainly was that Al atoms diffused to U-Mo alloy; diffusion mechanism was vacancy diffusion and growth kinetics showed reaction was controlled by the diffusion speed; the IL containing single phase was constituted mainly by （U, Mo） Al3; the IL containing two phases or more was constituted mainly by （U, Mo） Al3 and （U, Mo） Al4 and Al20Mo2U; and Si impurity in the LT24 Al was easy to enrich in the IL which showed Si added to Al could play positive role on improve compatibility between U-Mo and Al.

关 键 词：U-10wt%Mo合金 LT24Al 反应扩散 

分 类 号：TG13[一般工业技术—材料科学与工程]