Nucleation mechanism of intra-granular blisters in tungsten exposed to hydrogen plasma

被引:20
作者
Chen, W. Q. [1 ,2 ]
Wang, X. Y. [1 ]
Li, K. L. [1 ]
Wang, Y. N. [1 ]
Morgan, T. W. [3 ]
Xu, B. [1 ]
Chiu, Y. L. [2 ]
Liu, W. [1 ]
机构
[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
[2] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
[3] DIFFER Dutch Inst Fundamental Energy Res, De Zaale 20, NL-5612 AJ Eindhoven, Netherlands
关键词
Tungsten; Hydrogen plasma; Blister; Nucleation mechanism; HIGH-FLUX; DEUTERIUM RETENTION; SUPERABUNDANT VACANCIES; LOW-ENERGY; SURFACE-MORPHOLOGY; BUBBLE NUCLEATION; MICROSTRUCTURE; DEFORMATION; DEPENDENCE;
D O I
10.1016/j.scriptamat.2020.06.024
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Despite being a subject of long-term research on fusion-reactor structural materials, the behaviour of hydrogen in tungsten under plasma exposure remains unclear. Here, the explicit transmission electron microscopy observations for recrystallised W after hydrogen plasma exposure are successfully obtained. These are the first observations to show the intra-granular blisters are located on the {100} planes. Molecular dynamics simulations confirm the hydrogen blister initiating at < 100 > dislocation core behaved similarly to those in experiment. We propose that the widely reported intra-granular hydrogen blisters are nucleated at the < 100 > edge dislocation core and develop along the (100) plane in tungsten. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:243 / 249
页数:7
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