期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-07712-x
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资金
- National Natural Science Foundation of China [11575114, 51571120]
- High-Level Research Program of the Yanshan University [005000201]
- National Magnetic Confinement Fusion Energy Research Project of China [2015GB113000]
- Pacific Northwest National Laboratory
- United States Department of Energy [DE-AC05-76RL01830]
- US NSF-CMMI Program [1728419]
- DOE-Office of Nuclear Energy [NEUP-18-15703]
- US NSF-DMR-MMN [1611380]
Nanocrystalline (NC) metals are stronger and more radiation-tolerant than their coarse-grained (CG) counterparts, but they often suffer from poor thermal stability as nanograins coarsen significantly when heated to 0.3 to 0.5 of their melting temperature (T-m). Here, we report an NC austenitic stainless steel (NC-SS) containing 1 at% lanthanum with an average grain size of 45 nm and an ultrahigh yield strength of similar to 2.5 GPa that exhibits exceptional thermal stability up to 1000 degrees C (0.75 T-m). In-situ irradiation to 40 dpa at 450 degrees C and ex-situ irradiation to 108 dpa at 600 degrees C produce neither significant grain growth nor void swelling, in contrast to significant void swelling of CG-SS at similar doses. This thermal stability is due to segregation of elemental lanthanum and (La, O, Si)-rich nanoprecipitates at grain boundaries. Microstructure dependent cluster dynamics show grain boundary sinks effectively reduce steady-state vacancy concentrations to suppress void swelling upon irradiation.
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