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Influence of nanochannel structure on helium-vacancy cluster evolution and helium retention

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [2];  [3];  [4];  [4];  [5];  [5]
  1. Wuhan Univ. (China); Hunan Normal Univ., Changsha, (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. for High Energy Physics
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. CAMECA, Gennevilliers (France)
  5. Wuhan Univ. (China)
In the fusion reactors, plasma facing materials (PFMs) will be bombarded by large amounts of energetic particles, including helium (He) atoms. These metal-insoluble He atoms are prone to self-trapping or are trapped by vacancies, dislocation cores or grain boundaries, aggregating to form high concentration He bubbles which leads to serious degradation of the PFMs’ properties. Studying the initial stages of He-defect interactions becomes increasingly important because it not only helps us understand the formation mechanism of He bubbles but also provides insight to help design new irradiation-resistant PFMs. As such, in this work we used the positron annihilation Doppler broadening spectroscopy (DBS) and secondary ion mass spectrometry (SIMS) to explore the evolutions of the interactions between vacancy-type defects and He and the retention of He in the nanochannel W film irradiated with 190 keV He+ ions to different fluences under different temperatures. It is found that the presence of a nanochannel structure accelerates the release of He from the film even at low irradiation fluences, and the release of He is significantly enhanced at higher fluences, thus inhibiting or delaying the formation of large He-vacancy clusters in the nanochannel W film. Both irradiation fluence and temperature have significant influence on the formation and evolution of He-vacancy clusters, and the evolution of these microstructure also causes hardness changes.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Hubei Province, China; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1605128
Alternate ID(s):
OSTI ID: 22886502
Report Number(s):
LA-UR--19-30363
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 527; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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