Carbon nanotube (CNT) metal composites exhibit greatly reduced radiation damage

Cao, Penghui; So, Kang Pyo; Yang, Yang; Park, Jong Gil; Li, Mingda; Yan, Long; Hu, Jing; Kirk, Mark; Li, Meimei; Lee, Young Hee; Short, Michael P.; Li, Ju

doi:10.1016/j.actamat.2020.116483

Title: Carbon nanotube (CNT) metal composites exhibit greatly reduced radiation damage

Journal Article · Sat Nov 14 00:00:00 EST 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.116483· OSTI ID:1837082

Cao, Penghui ^[1]; So, Kang Pyo ^[2]; Yang, Yang ^[3]; Park, Jong Gil ^[4]; Li, Mingda ^[2]; Yan, Long ^[5]; Hu, Jing ^[6]; Kirk, Mark ^[6]; Li, Meimei ^[6];

^[4]; Short, Michael P. ^[2];

^[2]

Univ. of California, Irvine, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sungkyunkwan Univ. (Korea, Republic of)
Chinese Academy of Sciences, Shanghai (China)
Argonne National Lab. (ANL), Lemont, IL (United States)

Radiation damage of structural materials leads to mechanical property degradation, eventually inducing failure. Secondary-phase dispersoids or other radiation defect sinks are often added to materials to boost their radiation resistance. We demonstrate that a metal composite made by adding 1D carbon nanotubes (CNTs) to aluminum (Al) exhibits superior radiation resistance. In situ ion irradiation with transmission electron microscopy (TEM) and atomistic simulations together reveal the mechanisms of rapid defect migration to CNTs, facilitating defect recombination and enhancing radiation tolerance. The origin of this effect is an evolving stress gradient in the Al matrix resulting from CNT transformation under irradiation, and the stability of resulting carbides. Extreme value statistics of large defect behavior in our simulations highlight the role of CNTs in reducing accumulated damage. Furthermore, this approach to controlling defect migration represents a promising opportunity to enhance the radiation resistance of nuclear materials without detrimental effects.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC02-06CH11357; NE0008827; AC07-05ID14517

OSTI ID:: 1837082

Alternate ID(s):: OSTI ID: 1780032

Journal Information:: Acta Materialia, Vol. 203; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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