Effect of plastic deformation on deuterium retention and release in tungsten
Effect of plastic deformation on deuterium retention and release in tungsten
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DOI：
10.1063/1.4913478
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发表时间：
2015-02
影响因子：
3.2
通讯作者：
D. Terentyev;G. D. Temmerman;T. Morgan;Y. Zayachuk;K. Lambrinou;B. Minov;A. Dubinko;K. Bystrov;G. Oost
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文献类型：
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作者：
D. Terentyev;G. D. Temmerman;T. Morgan;Y. Zayachuk;K. Lambrinou;B. Minov;A. Dubinko;K. Bystrov;G. Oost
通过热解吸光谱和扫描电子显微镜研究了在等离子体发生器 Pilot-PSI 中暴露于高通量低能等离子体（通量 ~ 1024 D/m2/s，能量 ~ 50 eV，注量高达 3 × 1026 D/m2）的钨中严重塑性变形对氘保留的影响。参考样品和塑性变形样品中的解吸光谱被解卷积为分别归因于位错、氘空位簇和孔隙的解捕获的三个贡献。塑性引起的变形导致高位错密度，不会改变三个峰的位置，但与参考材料相比改变了它们的振幅。通过扫描电子显微镜检测到的气泡的出现以及归因于孔释放（即氘气泡）的解吸峰在塑性变形样品中被抑制，但仅达到一定的注量。超过 5 × 1025 D/m2 时，变形材料中气泡的释放量基本上高于参考材料中的气泡释放量。根据所提出的结果，我们建议，密集的位错网络通过为氘簇提供大量成核位点，最终通过在位错线上冲出凹凸而转变为氘空位簇，从而增加了与氘气泡相关的气泡出现所需的孵化剂量。
The effect of severe plastic deformation on the deuterium retention in tungsten exposed to high-flux low-energy plasma (flux ∼ 1024 D/m2/s, energy ∼ 50 eV, and fluence up to 3 × 1026 D/m2) at the plasma generator Pilot-PSI was studied by thermal desorption spectroscopy and scanning electron microscopy. The desorption spectra in both reference and plastically deformed samples were deconvolved into three contributions attributed to the detrapping from dislocations, deuterium-vacancy clusters, and pores, respectively. The plastically induced deformation, resulting in high dislocation density, does not change the positions of the three peaks, but alters their amplitudes as compared to the reference material. The appearance of blisters detected by scanning electron microscopy and the desorption peak attributed to the release from pores (i.e., deuterium bubbles) were suppressed in the plastically deformed samples but only up to a certain fluence. Beyond 5 × 1025 D/m2, the release from the bubbles in the deformed material is essentially higher than in the reference material. Based on the presented results, we suggest that a dense dislocation network increases the incubation dose needed for the appearance of blisters, associated with deuterium bubbles, by offering numerous nucleation sites for deuterium clusters eventually transforming into deuterium-vacancy clusters by punching out jogs on dislocation lines.