Erosion and morphology changes of F82H steel under simultaneous hydrogen and helium irradiation
Erosion and morphology changes of F82H steel under simultaneous hydrogen and helium irradiation
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DOI：
10.1016/j.fusengdes.2017.03.045
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发表时间：
2017-11-01
影响因子：
1.7
通讯作者：
Ueda, Y.
中科院分区：
文献类型：
--
作者：
Yakushiji, K.;Lee, H. T.;Ueda, Y.
已提议在聚变反应堆的第一壁中使用裸露的低活化铁素体马氏体（RAFM）钢。因此，有必要了解在熔融相关条件下直接同时注入 RAFM 钢的氢和氦时的侵蚀和表面形貌变化。实验在 500-900 K 的温度范围内以类似于 1 key 的离子能量进行，与覆盖区域的预期操作条件一致。照射注量为1×10(24)m(-2)，离子束中的He％为0.5％。测量辐照前后的质量损失以确定侵蚀。通过SEM/FIB观察表面形貌变化。 RBS 用于量化近表面 W 浓度。从 SEM 图像中，在 T > 750 K 时观察到表面粗糙化，并形成复杂的表面结构，其峰峰值变化在类似于 μ m 范围内。质量损失随着表面粗糙度的增加而增加，但与仅氢情况相比，同时氢-氦情况下的损失系统地更高。同时测量到了相应较低的表面 W 浓度，表明氦在 W 表面富集过程中具有重要作用。(C) 2017 Elsevier B.V. 保留所有权利。
The use of bare Reduced Activation Ferritic Martensitic (RAFM) steels has been proposed for the first wall in a fusion reactor. Thus, it is necessary to understand the erosion and surface morphology changes under direct and simultaneous hydrogen and helium implantation of RAFM steels under fusion-relevant condition. Experiments were performed at ion 'energies of similar to 1 key over the temperature range of 500-900 K, consistent with the anticipated operating conditions of the blanket region. The irradiation fluence was 1 x 10(24) m(-2) and the He% in the ion beam was 0.5%. Mass loss was measured before and after irradiation to determine erosion. Surface morphology changes were observed by SEM/FIB. RBS was used to quantify the near surface W concentration. From SEM images, surface roughening was observed at T > 750 K and complex surface structures formed with peak-to-peak variation in the similar to mu m range. Mass loss increased with increasing surface roughening but the loss for simultaneous hydrogen-helium case was systematically higher compared to hydrogen-only case. A corresponding lower surface W concentration was measured for the simultaneous case, indicating Helium has an important role in W surface enrichment process.(C) 2017 Elsevier B.V. All rights reserved.