Nano Archive

Do Twin Boundaries Always Strengthen Metal Nanowires?

Zhang, Yongfeng and Huang, Hanchen (2009) Do Twin Boundaries Always Strengthen Metal Nanowires? Nanoscale Research Letters, 4 (1). pp. 34-38. ISSN 1931-7573 (Print) 1556-276X (Online)

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Official URL: http://www.springerlink.com/content/0h582205r17g44...

Abstract

It has been widely reported that twin boundaries strengthen nanowires regardless of their morphology—that is, the strength of nanowires goes up as twin spacing goes down. This article shows that twin boundaries do not always strengthen nanowires. Using classical molecular dynamics simulations, the authors show that whether twin boundaries strengthen nanowires depends on the necessary stress for dislocation nucleation, which in turn depends on surface morphologies. When nanowires are circular cylindrical, the necessary stress of dislocation nucleation is high and the presence of twin boundaries lowers this stress; twin boundaries soften nanowires. In contrast, when nanowires are square cylindrical, the necessary stress of dislocation nucleation is low, and a higher stress is required for dislocations to penetrate twin boundaries; they strengthen nanowires.

Item Type:Article
Uncontrolled Keywords:Nanowire - Twin - Strengthening - Dislocation - Simulation
Subjects:Material Science > Nanostructured materials
ID Code:3661
Deposited By:Lesley Tobin
Deposited On:19 Jan 2009 12:35
Last Modified:19 Jan 2009 12:35

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