Hydrogen isotope plasma-driven permeation through RAFM steel: isotope exchange and helium irradiation effect
Hydrogen isotope plasma-driven permeation through RAFM steel: isotope exchange and helium irradiation effect
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DOI：
10.1088/1741-4326/aca91d
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发表时间：
2022-12
期刊：
影响因子：
3.3
通讯作者：
Yue Xu;Kai Yang;Yuntao Xu;Laima Luo;J. Ni;Yucheng Wu
中科院分区：
文献类型：
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作者：
Yue Xu;Kai Yang;Yuntao Xu;Laima Luo;J. Ni;Yucheng Wu
采用等离子体驱动渗透（PDP）技术研究了中国低活化马氏体（CLAM）钢在670-920 K温度范围内的氢同位素交换。结果表明，随着H引入D等离子体，HD的渗透通量增加，而D2的渗透通量降低。然而，总D渗透通量几乎保持不变。这样的结果允许同位素置换的分析，并表明D2的减少被HD的上升所平衡。此外，HD的形成与血浆中H和D的含量密切相关。通过测量等离子体参数，包括电子温度和电子密度，使用三重朗缪尔探针的H和D等离子体解离/电离速率和入射通量的氢同位素效应进行了评估。讨论了等离子体电离率的同位素效应与渗透通量的同位素效应之间的相关性。同时，还进行了He等离子体预辐照和DPDP中的籽晶实验，研究了He等离子体对D扩散的影响。总D渗透通量被发现减少He播种。朗缪尔探针的数据分析表明，He的注入对D等离子体的电离率有一定的影响。此外，在同时D + He照射下，He原子优先被捕获在缺陷处，导致较浅的D浓度梯度，这描述了所观察到的D渗透速率的降低。He等离子体预辐照被发现降低D渗透通量，具有慢得多的突破以达到稳态。从瞬态渗透曲线定量推导出在He诱导的缺陷处捕获的D的量。据信，在近表面处形成的He气泡充当D原子的捕获位点，导致较低的有效扩散系数和在材料中的增强的保留。
Hydrogen isotope exchange in China low activation martensitic (CLAM) steel was investigated by plasma-driven permeation (PDP) measurements in the temperature range of ∼670–920 K. It was found that as H was introduced into D plasma, the permeation flux of HD increased while that of D2 decreased. The total D permeation flux, however, remained almost unchanged. Such a result allowed the analysis of isotope replacement and showed that the reduction of D2 is balanced by the rise of HD. In addition, the formation of HD was found to be closely related to the H and D content in plasma. Hydrogen isotopic effects on H and D plasma dissociation/ionization rate and on incident flux were evaluated by measuring plasma parameters including electron temperature and electron density using a triple Langmuir probe. The correlation between isotope effects on ionization rate in the plasma and isotope effects in the permeation flux was discussed. He plasma pre-irradiation and seeding during D PDP were also conducted to investigate the He effects on D diffusion. The total D permeation flux was found to be reduced by He seeding. Data analysis of Langmuir probe showed that ionization rate of D plasma was influenced by He seeding. Besides, under simultaneous D + He irradiation, He atoms were preferentially trapped at the defects resulting in a shallower D concentration gradient that described the observed decrease in D permeation rate. He plasma pre-irradiation was found to reduce D permeation flux with a much slower breakthrough to reach steady-state. The amount of D trapped at He-induced defects was derived quantitatively from the transient permeation curves. It is believed that He bubbles formed at the near surface act as trapping sites of D atoms, leading to a less effective diffusion coefficient and an enhanced retention in the material.