Microscopic Damage of Tungsten and Molybdenum Exposed to Low-Energy Helium Ions

Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10~（21）ions/m~2.s）He~＋at an irradiation temperature of 600℃and at a dose of1.0×10~（25）ions/m~2.This non-destructive conductive a...

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Published inPlasma science & technology Vol. 17; no. 4; pp. 331 - 336
Main Author 范红玉 杨杞 李欣 倪维元 牛金海 刘东平
Format Journal Article
LanguageEnglish
Published 01.04.2015
Subjects
Annealing
Damage
Defects
Irradiation
Low energy
Molybdenum
Nanostructure
Tungsten
低能量
原子力显微镜技术
多晶钨
微观
损害
氦离子
纳米结构
钼
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Summary:Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10~（21）ions/m~2.s）He~＋at an irradiation temperature of 600℃and at a dose of1.0×10~（25）ions/m~2.This non-destructive conductive atomic force microscopy technique provides direct observation and comparison of surface swellings with growth of nanoscale defects in the irradiated materials.A coral-like surface structure and nanostructured defects were formed in W when irradiated at a He＋dose of 1.0×10~（25）ions/m~2.Increasing the annealing temperature resulted in an increase in the size of nanostructured defects and serious surface damage of W.Compared to W,Mo suffered much less surface damage after being irradiated at various He~＋doses.
Bibliography:irradiation damage tungsten molybdenum conductive atomic force microscopy
34-1187/TL
Polycrystalline tungsten（W）and molybdenum（Mo）materials both non-annealed and annealed at temperatures of 800-1750~C have been irradiated with low-energy（220 eV）,high-flux（~10~（21）ions/m~2.s）He~＋at an irradiation temperature of 600℃and at a dose of1.0×10~（25）ions/m~2.This non-destructive conductive atomic force microscopy technique provides direct observation and comparison of surface swellings with growth of nanoscale defects in the irradiated materials.A coral-like surface structure and nanostructured defects were formed in W when irradiated at a He＋dose of 1.0×10~（25）ions/m~2.Increasing the annealing temperature resulted in an increase in the size of nanostructured defects and serious surface damage of W.Compared to W,Mo suffered much less surface damage after being irradiated at various He~＋doses.
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ISSN:1009-0630
DOI:10.1088/1009-0630/17/4/13