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Title: Nanochannel structures in W enhance radiation tolerance

Developing high performance plasma facing materials (PFMs) is one of the greatest challenges for fusion reactors, because PFMs face unprecedented harsh environments including high flux plasma exposure, fast neutron irradiation and large transmutation gas. Tungsten (W) is considered as one of the most promising PFMs. Rapid accumulation of helium (He) atoms in such environments can lead to the He bubbles nucleation and even the formation of nano- to micro-scale “fuzz” on W surface, which greatly degrade the properties of W itself. The possible ejection of large W particulates into the core plasma can cause plasma instabilities. In this paper, we present a new strategy to address the root causes of bubble nucleation and “fuzz” formation by concurrently releasing He outside of W matrix through the nano-engineered channel structure (nanochannels). Comparing to ordinary bulk W, nanochannel W films with high surface-to-volume ratios are found to not only delay the growth of He bubbles, but also suppress the formation of “fuzz” (less than a half of the “fuzz” thickness formation in bulk W). Finally, molecular dynamic (MD) simulation results elucidate that low vacancy formation energy and high He binding energy in the nanochannel surface effectively help He release and affect He clustersmore » distribution in W during He ion irradiation.« less
Authors:
 [1] ; ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ; ORCiD logo [4] ;  [1] ; ORCiD logo [3]
  1. Wuhan Univ. (China). School of Physics and Technology. Center for Ion Beam Application. Center for Electron Microscopy
  2. Univ. of California, San Diego, CA (United States). Center for Energy Research
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Hunan Univ., Changsha (China). Dept. of Applied Physics. School of Physics and Electronics
Publication Date:
Report Number(s):
LA-UR-18-24035
Journal ID: ISSN 1359-6454
Grant/Contract Number:
AC52-06NA25396; 11522543; 11475129; 51771073; 51571153; 2042017kf0194; 2016CFA080; 12-LR-237801
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 153; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities (China); Natural Science Foundation of Hubei Province (China); Univ. of California (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; tungsten; nanochannel formation; bubble; "fuzz"; simulation
OSTI Identifier:
1440458

Qin, Wenjing, Ren, Feng, Doerner, Russell P., Wei, Guo, Lv, Yawei, Chang, Sheng, Tang, Ming, Deng, Huiqiu, Jiang, Changzhong, and Wang, Yongqiang. Nanochannel structures in W enhance radiation tolerance. United States: N. p., Web. doi:10.1016/j.actamat.2018.04.048.
Qin, Wenjing, Ren, Feng, Doerner, Russell P., Wei, Guo, Lv, Yawei, Chang, Sheng, Tang, Ming, Deng, Huiqiu, Jiang, Changzhong, & Wang, Yongqiang. Nanochannel structures in W enhance radiation tolerance. United States. doi:10.1016/j.actamat.2018.04.048.
Qin, Wenjing, Ren, Feng, Doerner, Russell P., Wei, Guo, Lv, Yawei, Chang, Sheng, Tang, Ming, Deng, Huiqiu, Jiang, Changzhong, and Wang, Yongqiang. 2018. "Nanochannel structures in W enhance radiation tolerance". United States. doi:10.1016/j.actamat.2018.04.048.
@article{osti_1440458,
title = {Nanochannel structures in W enhance radiation tolerance},
author = {Qin, Wenjing and Ren, Feng and Doerner, Russell P. and Wei, Guo and Lv, Yawei and Chang, Sheng and Tang, Ming and Deng, Huiqiu and Jiang, Changzhong and Wang, Yongqiang},
abstractNote = {Developing high performance plasma facing materials (PFMs) is one of the greatest challenges for fusion reactors, because PFMs face unprecedented harsh environments including high flux plasma exposure, fast neutron irradiation and large transmutation gas. Tungsten (W) is considered as one of the most promising PFMs. Rapid accumulation of helium (He) atoms in such environments can lead to the He bubbles nucleation and even the formation of nano- to micro-scale “fuzz” on W surface, which greatly degrade the properties of W itself. The possible ejection of large W particulates into the core plasma can cause plasma instabilities. In this paper, we present a new strategy to address the root causes of bubble nucleation and “fuzz” formation by concurrently releasing He outside of W matrix through the nano-engineered channel structure (nanochannels). Comparing to ordinary bulk W, nanochannel W films with high surface-to-volume ratios are found to not only delay the growth of He bubbles, but also suppress the formation of “fuzz” (less than a half of the “fuzz” thickness formation in bulk W). Finally, molecular dynamic (MD) simulation results elucidate that low vacancy formation energy and high He binding energy in the nanochannel surface effectively help He release and affect He clusters distribution in W during He ion irradiation.},
doi = {10.1016/j.actamat.2018.04.048},
journal = {Acta Materialia},
number = ,
volume = 153,
place = {United States},
year = {2018},
month = {4}
}