Damage-tolerant nanotwinned metals with nanovoids under radiation environments
- Texas A & M Univ., College Station, TX (United States)
- China Univ. of Petroleum, Beijing (China)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- Grant/Contract Number:
- AC02-06CH11357; AC52-06NA25396; SC0010482
- OSTI ID:
- 1215410
- Alternate ID(s):
- OSTI ID: 1239108
- Report Number(s):
- LA-UR--14-27698; ncomms8036
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 6; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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