Design of Nano-Composites for Ultra-High Strengths and Radiation Damage Tolerance
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Author(s)
Demkowicz, Michael J.
Misra, Amit
Zhang, X.
Hoagland, R. G.
Nastasi, M.
Date Issued
January 2009
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1557/PROC-1188-LL06-01
