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,品格发生畸变,同时,衍射峰略向低角度偏移,品格发生膨胀,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.
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.
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