Damage-tolerant nanotwinned metals with nanovoids under radiation environments

Chen, Y.; Yu, K. Y.; Liu, Y.; Shao, S.; Wang, H.; Kirk, M. A.; Wang, J.; Zhang, X.

doi:10.1038/ncomms8036

Title: Damage-tolerant nanotwinned metals with nanovoids under radiation environments

Journal Article · Fri Apr 24 00:00:00 EDT 2015 · Nature Communications

DOI: https://doi.org/10.1038/ncomms8036 · OSTI ID:1215410

Chen, Y. ^[1]; Yu, K. Y. ^[2];

^[1];

^[3]; Wang, H. ^[3]; Kirk, M. A. ^[3];

^[4];

^[1]

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-06CH11357; SC0010482; AC52-06NA25396

OSTI ID:: 1215410

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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