Investigation on (gamma)-U phase stability and thermal compatibility ofdispersion fuel meats prepared with atomized U-16at.%Mo,U-14at.%Mo-2at.%Ru and U-14at.%Mo-2at.%Os

摘要

The y-U phase stability and the thermal compatibility of atomized U-16at.%Mo andU-14at.%Mo-2at.%X(: Ru, Os) dispersion fuel meats at an elevated temperature have been investigated. The atomized U-14at.%Mo-2at.%Os powder appeared to have longer decomposition time than the atomized U-14at.%Mo and U-14at.%Mo-2at.% powders. The inter-diffusion of atomized U-14at.%Mo-2at.%Os particles with Al matrix were shown to form thinner and more uniform layers than the other alloy particles. The Al atoms seem to diffuse more easily along the decomposed lamella inter-phases than the cell boundaries of Yphase. The addition of Os instead of Mo is expected to have a beneficial effect on increasing U-density of fuel due to better Y-U phase stability and thermal compatibility.