Hydrided furnace-cooled and water-quenched samples of Zr-2.5Nb pressure tube were studied in order to aid comprehension as regards the hydrogen redistribution that occurs during hydride precipitation in this material. Results showed a high fraction of γ-hydrides grown at hoop-grains in the quenched condition, resulting from the strong reduction in diffusion times imposed by quenching. This also lead to variations in δ-hydride distribution, δ-hydride populations and hydrogen solubility (TSS) during subsequent thermal cycling, for which an interpretation based on the memory effect of hydride precipitation was proposed. Experimental observations suggest that hydrogen redistribution during cool-down from high temperature is controlled not only by certain preferential grains, but also by the presence of misfit dislocations left by pre-existing hydride particles. A hypothesis was presented to explain the differences in precipitation solubility (TSSP) between furnace-cooled and water-quenched material, which was associated to the possible influence of misfit dislocations on the driving force for hydrogen diffusion.

研究了Zr-2.5Nb压力管的加湿炉冷却和水淬样品，以帮助理解在该材料中氢化物沉淀过程中发生的氢再分布。结果表明，在淬火条件下，箍状晶粒中生长出大量的γ-氢化物，这是由于淬火所引起的扩散时间大大减少所致。这还会导致在随后的热循环过程中δ氢化物分布，δ氢化物分布和氢溶解度（TSS）发生变化，为此提出了基于氢化物沉淀记忆效应的解释。实验观察表明，高温冷却过程中氢的重新分布不仅受某些优先晶粒的控制，而且还存在因预先存在的氢化物粒子而留下的错配位错。提出了一个假设来解释炉冷和水淬后的材料之间的沉淀溶解度（TSSP）差异，这与错配位错对氢扩散驱动力的可能影响有关。