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What is the Limit of Nanoparticle Strengthening?

Published online by Cambridge University Press:  31 January 2011

D.C. Chrzan ,
J.W. Morris Jr. ,
Y.N. Osetsky ,
R.E. Stoller  and
S.J. Zinkle
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Abstract

The stress required to deform a perfect crystal to its elastic limit while maintaining perfect periodicity, the so-called ideal strength, sets the gold standard for the strength of a given material. Materials this strong would be of obvious engineering importance, potentially enabling more efficient turbines for energy production, lighter materials for transportation applications, and more reliable materials for nuclear reactor applications. In practice, the strength of engineering materials is often more than two orders of magnitude less than the ideal strength due to easily activated deformation processes involving dislocations. For many materials, precipitate strengthening is a promising approach to impede dislocation motion and thereby improves strength and creep resistance. This observation begs the question: What are the limits of nanoparticle strengthening? Can the ideal strength of a matrix material be reached? To answer these questions, we need a detailed, atomic scale understanding of the interactions between dislocations and obstacles. Fortunately, simulations are beginning to explore this interaction.

Type
Research Article
Information
MRS Bulletin , Volume 34 , Issue 3: Atomistic Simulations of Mechanics of Nanostructures , March 2009 , pp. 173 - 177
Copyright
Copyright © Materials Research Society 2009

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