Solid-State Phase Transformation in Diffusion Couples of U-Mo/Nb

摘要:

采用包覆热轧法制备了U-Mo/Nb固相复合扩散偶。在790 ℃下对U-Mo/Nb固相复合扩散偶进行了扩散热处理。采用扫描电镜（SEM）观测了扩散偶的扩散层，采用能谱法测定了扩散层中不同固溶体相的组成。结果表明，30 h热处理后扩散偶Nb金属基体一侧得到的3种形式U-Nb固溶体，分析认为扩散层中最终固溶体相组成与U晶型转变及其合金化因素有关。

Abstract:

Solid bonding diffusion couples of U-Mo/Nb were made by clad and hot rolling. The diffusion couples were heat-treated at 790 °C for different time. The obversation of the diffusion layers was taken by scan electronic microscope and the main elements in different solid state phases were measured by energy dispersive spectrometer. The research results indicate that there exist were three different U-Nb phases coming into the Nb-base side of the diffusion couple heat-treated for 30 h. The phase components of the final solid state are associated with the phase transformation of U and the solubility of alloy elements in different U-phase