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

Published online by Cambridge University Press:  31 January 2011

Amit Misra ,
X. Zhang ,
M. J. Demkowicz ,
R. G. Hoagland  and
M. Nastasi
Amit Misra
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos, New Mexico, United States
X. Zhang
Affiliation:
[email protected], Texas A&M University, College Station, Texas, United States
M. J. Demkowicz
Affiliation:
[email protected], MIT, Cambridge, Massachusetts, United States
R. G. Hoagland
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos, New Mexico, United States
M. Nastasi
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos, New Mexico, United States
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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.

Keywords

dislocationscompositeradiation effects
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1188: Symposium LL – Architectured Multifunctional Materials , 2009 , 1188-LL06-01
Copyright
Copyright © Materials Research Society 2009

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