To study the effect of hydrogen isotopes on the delayed hydride cracking (DHC) behavior, Zr-2.5Nb pressure tube (PT) material was charged with about 100wppm hydrogen or deuterium and DHC tests were carried out between 202 and 283 °C. At 202 °C, DHC velocity ratio of hydrogen- and deuterium-charged Zr-2.5Nb PT material was less than the ideal value of √2. The lower velocity ratio was explained on the basis of terminal solid solubility for dissolution (TSSD) and residual hydrogen (H_R) present in deuterium-charged PT material. Using TSSD and H_R, a mixture rule was developed to predict the DHC velocity of deuterium-charged material (\({V}_{DHC}^{D}\)) as well as DHC velocity ratio of hydrogen- and deuterium-charged material. The mixture rule was evaluated using present data and data reported in literature.

为了研究氢同位素对延迟氢化物裂解 (DHC) 行为的影响，在 Zr-2.5Nb 压力管 (PT) 材料中装入约 100wppm 的氢或氘，并在 202 至 283 °C 之间进行 DHC 测试。在 202 °C 时，充氢和氘的 Zr-2.5Nb PT 材料的 DHC 速度比小于理想值 √2。较低的速度比是基于溶解的末端固溶度 ( TSSD ) 和存在于带氘电的 PT 材料中的残余氢 ( HR _{)来解释的。}使用TSSD和H _R，开发了一种混合规则来预测氘带电材料的 DHC 速度 ( \({V}_{DHC}^{D}\)) 以及带氢和氘的材料的 DHC 速度比。使用现有数据和文献报道的数据评估混合规则。