Surface blistering and deuterium retention behaviors in pure and ZrC-doped tungsten exposed to deuterium plasma
Surface blistering and deuterium retention behaviors in pure and ZrC-doped tungsten exposed to deuterium plasma
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DOI：
10.1088/1741-4326/abdfda
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发表时间：
2021-01
期刊：
影响因子：
3.3
通讯作者：
Xuexi Zhang;L. Qiao;Hong Zhang;Yuhong Li;Peng Wang;Chang Liu
中科院分区：
文献类型：
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作者：
Xuexi Zhang;L. Qiao;Hong Zhang;Yuhong Li;Peng Wang;Chang Liu
研究了暴露于 D 等离子体的纯钨 (W) 和 0.5 wt% ZrC 掺杂 W 合金 (WZC) 的表面起泡和氘 (D) 保留行为，作为高达 2.6 × 1025 D m−2 的入射 D 通量的函数。表面观察表明，W 样品上形成了大尺寸水泡（∼8–10 μm）和一些小水泡（<2 μm）。对于WZC，样品表面覆盖有高密度的小水泡（<1μm），没有发现大于2μm的水泡。横截面视图显示，大尺寸的气泡源自表面下晶界，而小气泡源自更接近表面的深度的晶内空腔。对于两种类型的样品，颗粒内气泡优先在法线方向接近[111]的颗粒上形成。纯W中形成的晶间气泡在WZC中得到显着抑制，并且WZC中气泡形成的注量阈值低于W中的。D深度分布表明，注入的D主要保留在WZC和W的近表面区域。此外，在WZC中0.1~0.25μm深度处观察到更高更宽的D峰，但强度和 W 中 D 峰的宽度更小、更薄。与 W 相比，WZC 的解吸光谱向低温侧移动，并且 WZC 和 W 中的总保留 D 量在 2.8 × 1024–2.6 × 1025 D m−2 的注量范围内相当。
Surface blistering and deuterium (D) retention behaviors in pure tungsten (W) and 0.5 wt% ZrC-doped W alloy (WZC) exposed to D plasma have been investigated as a function of incident D fluence up to 2.6 × 1025 D m−2. Surface observations show that large-sized blisters (∼8–10 μm) and a few small blisters (<2 μm) are formed on the W samples. For WZC, the surface of the samples is covered by a high density of small blisters (<1 μm), and no blister larger than 2 μm is found. Cross section views show that the large-sized blisters originate from subsurface grain boundaries, and the small blisters originate from intra-granular cavities at depths much closer to the surface. The intra-granular blisters are preferentially formed on the grains with a normal direction close to [111] for both types of sample. The inter-granular blisters formed in pure W are significantly suppressed in WZC, and the fluence threshold for blister formation in WZC is lower than that in W. The D depth distributions indicate that the implanted D is mainly retained in the near-surface region of WZC and W. Besides, a higher and broader D peak is observed at a depth of between 0.1–0.25 μm in WZC, but the intensity and width of the D peak is lower and thinner in W. The desorption spectra of WZC shift to the lower temperature side as compared to W, and the total retained D amount in WZC and W is comparable in the fluence range of 2.8 × 1024–2.6 × 1025 D m−2.