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Design of Nano-Composites for Ultra-High Strengths and Radiation Damage Tolerance

Author(s)
Demkowicz, Michael J.; Misra, Amit; Zhang, X.; Hoagland, R. G.; Nastasi, M.
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Abstract
The combination of high strength and high radiation damage tolerance in nanolaminate composites can be achieved when the individual layers in these composites are only a few nanometers thick and therefore these materials contain a large volume fraction associated with interfaces. These interfaces act both as obstacles to slip, as well as sinks for radiation-induced defects. The morphological and phase stabilities of these nano-composites under ion irradiation are explored as a function of layer thickness, temperature and interface structure. Using results on model systems such as Cu-Nb, we highlight the critical role of the atomic structure of the incoherent interfaces that exhibit multiple states with nearly degenerate energies in acting as sinks for radiation-induced point defects. Reduced radiation damage also leads to a reduction in the irradiation hardening, particularly at layer thickness of approximately 5 nm and below. The strategies for design of radiation-tolerant structural materials based on the knowledge gained from this work will be discussed.
Date issued
2009-01
URI
http://hdl.handle.net/1721.1/69036
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
MRS Symposium Proceedings
Publisher
Cambridge University Press
Citation
Misra, A., et al. "Design of Nano-Composites for Ultra-High Strengths and Radiation Damage Tolerance." Mater. Res. Soc. Symp. Proc. Vol. 1188
Version: Author's final manuscript
ISSN
1946-4274

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