低能氦离子辐照诱导的钨材料结构演化

李萌; 范红玉; 崔荷敬; 范宏裕; 韦理山

doi:10.11889/j.0253-3219.2017.hjs.40.100201

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低能氦离子辐照诱导的钨材料结构演化

低能加速器技术、射线技术及应用 | 更新时间：2021-05-19

- 低能氦离子辐照诱导的钨材料结构演化
- Low-energy helium-ions irradiation induced morphology and crystalline evolution of tungsten
- 核技术 2017年40卷第10期文章编号：100201
- 作者机构：
  
  大连民族大学物理与材料工程学院大连 116600
- 作者简介：
  
  [ "李萌, 男, 1995年出生, 目前就读于大连民族大学攻读学士学位, 研究领域为材料辐照损伤", "LI Meng, male, born in 1995, undergraduate, mainly engaged in the irradiation damage of plasma facing materials" ]
  范红玉, E-mail:fanhy@dlnu.edu.cn FAN Hongyu, E-mail:fanhy@dlnu.edu.cn
- 基金信息：
  
  国家自然科学基金(11405023);辽宁省自然科学基金指导计划项目(201602189);国家级大学生创新创业训练计划项目(G201612026048);大连民族大学"太阳鸟"学生科研项目资助(tyn2017xxx)
- DOI：10.11889/j.0253-3219.2017.hjs.40.100201
  中图分类号： TL627
- 收稿日期：2017-06-21，
  
  修回日期：2017-07-17，
  
  纸质出版日期：2017-10
- 稿件说明：
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李萌, 范红玉, 崔荷敬, 等. 低能氦离子辐照诱导的钨材料结构演化[J]. 核技术, 2017,40(10):100201

Meng LI, Hongyu FAN, Hejing CUI, et al. Low-energy helium-ions irradiation induced morphology and crystalline evolution of tungsten[J]. Nuclear techniques, 2017, 40(10): 100201
李萌, 范红玉, 崔荷敬, 等. 低能氦离子辐照诱导的钨材料结构演化[J]. 核技术, 2017,40(10):100201 DOI： 10.11889/j.0253-3219.2017.hjs.40.100201.

Meng LI, Hongyu FAN, Hejing CUI, et al. Low-energy helium-ions irradiation induced morphology and crystalline evolution of tungsten[J]. Nuclear techniques, 2017, 40(10): 100201 DOI： 10.11889/j.0253-3219.2017.hjs.40.100201.

摘要

在温度为923 K、氦离子流强为7×10

-2

·s

-1

的条件下，考察了低能氦离子辐照对钨材料表面结构的影响。采用扫描电子显微镜（Scanning Electron Microscope，SEM）、导电原子力显微镜（Conductive Atomic Force Microscope，CAFM）、称重法、X射线衍射（X-ray Diffraction，XRD）以及电子背散射衍射（Electron Back-Scattered Diffraction，EBSD）对辐照后钨材料的结构演化规律进行了分析。SEM和CAFM的研究表明，在辐照初期样品表面形成了纳米尺寸的氦泡，随着辐照剂量的增加，氦泡的尺寸和密度逐渐增加，最终引起钨表层的剥落。质量损失和溅射产额的分析结果表明，钨材料表层的剥落是钨损伤的主要形式。SEM、XRD和EBSD的分析证实了辐照后钨样品的表面形貌变化与晶体取向之间具有很强的关联性。研究结果表明，相对于（101），氦原子更容易在（111）和（001）等晶面上吸附、扩散和聚集，这些研究结果将为面向等离子体材料的优化设计提供有用的参考。

Abstract

Background

Currently

tungsten has been selected as one of the best plasma-facing materials for international thermonuclear experimental reactor (ITER) due to its low hydrogen solubility

low sputtering yield

high melting point and high thermal conductivity.

Purpose

In this paper

the responses of polycrystalline tungsten to low-energy helium-ions irradiation were investigated.

Methods

Helium-ions irradiation was performed at 923 K with a He

flux of 7×10

-2

×s

-1

. A strong correlation between the surface morphology change and the grain orientation was confirmed from scanning electron microscope (SEM)

conducive atomic force microscope (CAFM)

X-ray diffraction (XRD) and electron backscattered diffraction (EBSD) analysis.

Results

SEM and CAFM measurement revel that nano-scale helium bubble formed on the surface of tungsten at earlier stage. The size and number of the formed helium bubbles increase with the increase of helium fluence until they break. Mass loss and sputtering yields analysis indicated that the surface spalling caused by the damage of helium bubble is the main format of tungsten damage. XRD and EBSD found that helium atom is shown to be not energetically favorable to dissolve

self-trap and cluster at (101) surface in comparison to (111) and (001) surface.

Conclusion

The results will provide a useful reference for optimization of the plasma facing materials.

关键词

Keywords

references

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