SIMP钢中H对He热解吸行为的影响研究

为了初步理解核用结构材料中H对He行为的影响，以He离子单独辐照和He和H离子连续辐照作为对比，利用热释放谱(TDS)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)研究了SIMP中H对He的热解吸和滞留行为的影响。TDS结果表明:He释放的主峰主要出现在1 198~1 222 K之间，对应于气泡的迁移释放机制。相对于He单独辐照，H的附加辐照使得He的释放峰向低温移动，且释放量增大。即H促进了He的热解吸。另外，H对He热解吸的促进作用与H的辐照剂量有关。当H注入的峰值浓度(原子分数)从5%增加到50%时，这种促进作用有所减弱。结合TEM和SEM结果发现:H的存在促进了TDS加热过程中材料表面的起泡行为，从而加速了He以气泡迁移机制释放的过程。

Study on the Effect of H on He Thermal Desorption Behavior in SIMP Steel

In order to provide a basic understanding on the effect of H on He behaviors in the structural materials for the future nuclear systems, the effect of H on He thermal desorption and retention behaviors in SIMP steels was studied using thermal desorption spectroscopy(TDS), scanning electron microscope(SEM), and transmission electron microscopy(TEM) by comparing the results of the alone irradiation of 130 keV He+ and the sequential irradiation of 130 keV He+ and 160 keV H₂+. The TDS results show that a major peak of He release occurred in the temperature of 1 198~1 222 K via the mechanism of bubble migration. The peak temperature of He release was lower and the release amount was larger under the sequential irradiation of He+ and H₂+ than that under the He+-alone irradiation. This indicates that He desorption was enhanced by the additional H irradiation. In addition, the enhancement effect of H on He thermal desorption depends on the dose of H irradiation. When the peak concentration of H increased from 5% to 50% (atom fraction), this enhancement effect was weakened. Combined with TEM and SEM results, it was found that the presence of H promoted the surface blistering during TDS heating, thus accelerating the release of He by the mechanism of bubble migration.