期刊
ACTA MATERIALIA
卷 240, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2022.118293
关键词
In situ TEM; Heavy ion irradiation; Helium effect; Void shrinkage; Critical Bubble Model
资金
- U.S. Office of Navel Research [NSF-CMMI-1728419]
- NSF- DMR-Metallic Materials and Nanostructures Program [NSF-CMMI-1728419, N0 0 014-22-1-2160]
- DOE, Office of Nuclear Energy [N0 0 014-20-1-2043]
- [1611380]
The presence of helium has a significant impact on the evolution of voids under high-temperature radiation, as it can stabilize the nanovoids and prevent them from shrinking.
Helium is a common nuclear reaction product, and it plays an important role in radiation-induced void swelling. Although extensive studies have been conducted to investigate the helium effects in metals and alloys, most of them were based on the post-irradiation analyses or computer simulations. Conclusive evidence that can demonstrate how voids evolve in the presence of He under high-temperature radiation remains limited. In this work, we performed in situ heavy ion radiation studies in a transmission electron microscope to compare the radiation response of the preexisting nanovoids in single crystal copper sub-jected to a single beam of 1 MeV Kr ions and a sequential dual beam of 14 keV He ion and 1 MeV Kr ion at 350 degrees C. Our studies revealed that the nanovoids would contract continuously until being eliminated when irradiated by a single beam of Kr ions. In comparison, the nanovoids in helium-injected Cu could reach a stable state and eventually stopped shrinking. Moreover, the influence of helium on the kinetics of void/bubble evolution under heavy ion irradiation was discussed within the framework of a proposed critical bubble model and bubble coarsening model.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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