Preferential void formation at crystallographically ordered grain boundaries in nanotwinned copper thin films

LaGrange, Thomas; Arakawa, Kazuto; Yasuda, Hidehiro; Kumar, Mukul

doi:10.1016/j.actamat.2015.06.015

Title: Preferential void formation at crystallographically ordered grain boundaries in nanotwinned copper thin films

Journal Article · Wed Jun 24 00:00:00 EDT 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.06.015· OSTI ID:1886154

LaGrange, Thomas ^[1]; Arakawa, Kazuto ^[2]; Yasuda, Hidehiro ^[3]; Kumar, Mukul ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Shimane University, Matsue (Japan); Core Research for Evolutional Science and Technology (CREST), Tokyo (Japan)
Osaka University (Japan)

We report nanocrystalline materials are expected to have improved radiation resistance as the high density of grain boundary area is thought to act as an effective sink for radiation-induced defects. However, continued absorption of defects can alter the structure of grain boundaries and/or enhance their mobility, eventually leading to microstructural degradation in the form of grain coarsening, thus negating their initial radiation tolerance. Hence, an ideal microstructure might be one with a mix of boundaries that are effective sinks and limit grain coarsening. We show through in situ electron irradiation experiments, however, that this is an insufficient condition. Our observations indicate that even a high density of low energy coherent twin boundaries, supposedly stabilizing the microstructure against grain coarsening, can be a detriment in that it biases the mobility of vacancies accumulating during irradiation thereby resulting in preferential void nucleation near twin boundaries. These observations highlight the fact that radiation induced grain boundary migration depends greatly on the topology of the grain boundary network and that the migration of high-angle grain boundaries can be hindered when coordinated at triple junctions composed of at least two low-energy boundaries, e.g., coincidence site lattice boundaries.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1886154

Alternate ID(s):: OSTI ID: 1251845

Report Number(s):: LLNL-JRNL-665138; 786421

Journal Information:: Acta Materialia, Vol. 96, Issue N/A; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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