STUDY OF PHASES IN U-10wt%Zr ALLOY BY NEUTRON DIFFRACTION

U 10wt%Zr alloy has been analysed by neutron diffraction method to determine the constituent phases and their crystal structures.The collected diffraction data are processed using Rietveld' s profile technique (with program“ Fullprof ”). Four phases,α-U,δ, γand α Zr, in the alloy at room temperature and the corresponding volume fractions as well their structural parameters are obtained from the data analysis, For the δ-phase, a partially ordered unusual hexagonal structure of the modified C32(AlB2) type is confirmed.

氢化-去氢化法制备铀锆合金粉体

铀锆合金粉体是粉末冶金法制备核反应堆用铀合金燃料的原料。采用氢化-去氢化法制备了铀锆合金粉末,用XRD及SEM进行了微观形貌的观察。结果显示,制粉前的预处理相当重要,直接影响铀锆合金的氢化性能;随着氢化-去氢化次数的增加,吸氢量随之增加,且活化10次后,吸氢量达到稳定值;在650℃下的去氢化处理后对粉体的XRD及SEM形貌观察表明,U-10%Zr（质量分数）粉体为单纯的？相,没有相的转变,随着氢化-去氢化次数的增加,中间颗粒的粒度（100~150？m）分布所占的比例逐渐升高。