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Philosophical Magazine Volume 84, 2004 - Issue 20
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Original Articles

Misfit dislocation loops in composite nanowires

I. A. Ovid'ko Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Bolshoj 61, Vasil'evskii Ostrov, St Petersburg 199178, Russia
&
A. G. Sheinerman Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Bolshoj 61, Vasil'evskii Ostrov, St Petersburg 199178, Russia
Pages 2103-2118 | Received 28 Oct 2003, Published online: 02 Sep 2006
 
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Abstract

A new mechanism for relaxation of misfit stresses in composite nanowires (quantum wires) is suggested and theoretically examined, namely the formation of misfit dislocation loops. The stress field of a prismatic dislocation loop in a cylinder (nanowire) is calculated. The parameters of two-phase composite nanowires at which the formation of misfit dislocation loops is energetically favourable are estimated. The effect of stress fields of dislocation loops on the formation of compositionally modulated nanowires is discussed.

Acknowledgements

This work was supported, in part, by the Office of US Naval Research (grant N00014-01-1-1020), ‘Integration’ Program (grant B26), Russian Fund of Basic Researches, Russian Academy of Sciences Program ‘Structural mechanics of materials and construction elements’, and St Petersburg Scientific Center.

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