期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8036
关键词
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资金
- NSF-DMR-Metallic Materials and Nanostructures Program [1304101]
- DOE-OBES [DE-SC0010482]
- Los Alamos National Laboratory Directed Research and Development [LDRD-ER20140450]
- DOE-Office of Nuclear Energy
- Texas A&M University Online Access to Knowledge (OAK) Fund
- University Libraries
- Office of the Vice President for Research
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1304101] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1643915] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0010482] Funding Source: U.S. Department of Energy (DOE)
Material performance in extreme radiation environments is central to the design of future nuclear reactors. Radiation induces significant damage in the form of dislocation loops and voids in irradiated materials, and continuous radiation often leads to void growth and subsequent void swelling in metals with low stacking fault energy. Here we show that by using in situ heavy ion irradiation in a transmission electron microscope, pre-introduced nanovoids in nanotwinned Cu efficiently absorb radiation-induced defects accompanied by gradual elimination of nanovoids, enhancing radiation tolerance of Cu. In situ studies and atomistic simulations reveal that such remarkable self-healing capability stems from high density of coherent and incoherent twin boundaries that rapidly capture and transport point defects and dislocation loops to nanovoids, which act as storage bins for interstitial loops. This study describes a counterintuitive yet significant concept: deliberate introduction of nanovoids in conjunction with nanotwins enables unprecedented damage tolerance in metallic materials.
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