Nanochannel structures in W enhance radiation tolerance

Qin, Wenjing; Ren, Feng; Doerner, Russell P.; Wei, Guo; Lv, Yawei; Chang, Sheng; Tang, Ming; Deng, Huiqiu; Jiang, Changzhong; Wang, Yongqiang

doi:10.1016/j.actamat.2018.04.048

Nanochannel structures in W enhance radiation tolerance

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.04.048· OSTI ID:1440458

Qin, Wenjing ^[1]; ^[1]; Doerner, Russell P. ^[2]; Wei, Guo ^[1]; Lv, Yawei ^[1]; Chang, Sheng ^[1]; Tang, Ming ^[3]; ^[4]; Jiang, Changzhong ^[1]; ^[3]

Wuhan Univ. (China). School of Physics and Technology. Center for Ion Beam Application. Center for Electron Microscopy
Univ. of California, San Diego, CA (United States). Center for Energy Research
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Hunan Univ., Changsha (China). Dept. of Applied Physics. School of Physics and Electronics

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: Fundamental Research Funds for the Central Universities (China); LANL Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Hubei Province (China); USDOE; Univ. of California (United States)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1440458

Alternate ID(s):: OSTI ID: 1548427
OSTI ID: 22744653

Report Number(s):: LA-UR-18-24035

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 153; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Irradiation-Dependent Helium Gas Bubble Superlattice in Tungsten Sprouster, D. J.; Sun, C.; Zhang, Y. Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-39053-0	journal	February 2019
Helium flux effects on bubble growth and surface morphology in plasma-facing tungsten from large-scale molecular dynamics simulations Hammond, Karl D.; Naeger, Ian V.; Widanagamaachchi, Wathsala Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab12f6	journal	May 2019
Understanding the release of helium atoms from nanochannel tungsten: a molecular dynamics simulation Wei, Guo; Ren, Feng; Fang, Jingzhong Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab14c7	journal	June 2019
Ion beam analysis of fusion plasma-facing materials and components: facilities and research challenges Mayer, M.; Möller, S.; Rubel, M. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5817	journal	December 2019

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