【摘要】 为了解Pd及其合金贮氚（T）老化后.³He在材料中的存在形式及分布状态.利用XRD与TEM分别分析了贮T老化1.6和3.5 a的Pd粉,以及贮T老化41和295 d的Pd_91.31Y_8.50Ru_0.19合金膜的结构变化.结果表明:T老化使得Pd粉的XRD峰变宽且峰强降低,晶格发生畸变,同时,衍射峰略向低角度偏移,晶格发生膨胀,1.6和3.5 a老化后,晶格常数分别增加0.095%和0.11%;在老化41 d的Pd_91.31Y_8.50Ru_0.19合金膜中,观察到分布均匀、直径约为1 nm的He泡,同时存在高密度的位错及位错环,在老化295 d的样品中,He泡直径略微增加,达1.2-1.4 nm,且分布均匀,位错及位错环密度降低.更多还原

【Abstract】 During tritium（T） treatment,Pd and its alloys will be aged due to solution of ³He, a product of T decay,in lattices,which changes the microstructure and properties of the materials. The existing and distributing states of ³He in Pd and Pd_91.31Y_8.50Ru_0.19 alloy during T aging were studied by XRD and TEM.XRD results for Pd powders aged up to 1.6 and 3.5 a show that the peaks widen,intensities of peaks reduce and lattice constants increase by 0.095%and 0.11%,respectively. TEM observations show that about 1 nm sized He bubbles appear in Pd_91.31Y_8.50Ru_0.19 alloy aged for 41 d,and more dislocations and dislocation loops are observed;after 295 d aging,the He bubbles grow slightly and reach 1.2-1.4 nm in diameter,but the amounts of dislocations and dislocation loops decrease.更多还原