期刊
JOURNAL OF NUCLEAR MATERIALS
卷 502, 期 -, 页码 132-140出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.02.013
关键词
Nanochannel structure; He concentration; Swelling; Hardening
资金
- Natural Science Foundation of China [11475129, 51571153, 11375134]
- National Science Fund for Excellent Young Scholars [11522543]
- Program for New Century Excellent Talents in University [NCET-13-0438]
- Natural Science Foundation of Hubei Province, China [2016CFA080]
- Fundamental Research Funds for the Central Universities [2042017kf0194]
- University of California Office of President Research Fund [12-LR-237801]
- Los Alamos Laboratory Directed Research and Development Fund [LDRD-20160567ER]
- Center for Integrated Nanotechnologies (CINT), a DOE nanoscience user facility
Plasma facing materials (PFMs) face one of the most serious challenges in fusion reactors, including unprecedented harsh environment such as 14.1 MeV neutron and transmutation gas irradiation at high temperature. Tungsten (W) is considered to be one of the most promising PFM, however, virtually insolubility of helium (He) in W causes new material issues such as He bubbles and W fuzz microstructure. In our previous studies, we presented a new strategy using nanochannel structure designed in the W film to increase the releasing of He atoms and thus to minimize the He nucleation and fuzz formation behavior. In this work, we report the further study on the diffusion of He atoms in the nanochannel W films irradiated at a high temperature of 600 degrees C. More specifically, the temperature influences on the formation and growth of He bubbles, the lattice swelling, and the mechanical properties of the nanochannel W films were investigated. Compared with the bulk W, the nanochannel W films possessed smaller bubble size and lower bubble areal density, indicating that noticeable amounts of He atoms have been released out along the nanochannels during the high temperature irradiations. Thus, with lower He concentration in the nanochannel W films, the formation of the bubble superlattice is delayed, which suppresses the lattice swelling and reduces hardening. These aspects indicate the nanochannel W films have better radiation resistance even at high temperature irradiations. (c) 2018 Elsevier B.V. All rights reserved.
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