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

FAN Hongyu (范红玉); YANG Qi (杨杞); LI Xin (李欣); NI Weiyuan (倪维元); NIU Jinhai (牛金海); LIU Dongping (刘东平)

doi:10.1088/1009-0630/17/4/13

Plasma Science and Technology > 2015 > 17(4): 331-336. > DOI: 10.1088/1009-0630/17/4/13

FAN Hongyu (范红玉), YANG Qi (杨杞), LI Xin (李欣), NI Weiyuan (倪维元), NIU Jinhai (牛金海), LIU Dongping (刘东平). Microscopic Damage of Tungsten and Molybdenum Exposed to Low-Energy Helium Ions[J]. Plasma Science and Technology, 2015, 17(4): 331-336. DOI: 10.1088/1009-0630/17/4/13

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

1 School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China 2 Fujian Key Laboratory for Plasma and Magnetic Resonance, Department of Electronic Science, Aeronautics, School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China 3 Liaoning Key Laboratory of Optoelectronic Film and Materials, Dalian 116600, China

Funds: supported by the National Magnetic Confinement Fusion Program of China (No. 2011GB108011), National Natural Science Foun- dation of China (No. 11405023) and the Scientific Research Fund of Liaoning Provincial Education Department (No. L2014539) and the Fundamental Research Funds for the Central Universities of China (No. DC201502080410)

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Received Date: July 08, 2014

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Abstract

Abstract

Polycrystalline tungsten (W) and molybdenum (Mo) materials both non-annealed and annealed at temperatures of 800-1750 ^o C have been irradiated with low-energy (220 eV), high-flux (∼10²¹ ions/m² ·s) He + at an irradiation temperature of 600^o C and at a dose of 1.0×10 25 ions/m² . 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/m² . 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.
- irradiation damage,
- tungsten,
- molybdenum,
- conductive atomic force microscopy

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