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Dislocation surface nucleation in surfactant-passivated metallic nanocubes

Published online by Cambridge University Press:  20 June 2019

Mehrdad T. Kiani Open the ORCID record for Mehrdad T. Kiani [Opens in a new window] ,
Radhika P. Patil Open the ORCID record for Radhika P. Patil [Opens in a new window]  and
X. Wendy Gu
Mehrdad T. Kiani
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
Radhika P. Patil
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
X. Wendy Gu*
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA
*
Address all correspondence to Wendy Gu at xwgu@stanford.edu
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Abstract

The strength of single-crystalline nanoscale metals is controlled by dislocation nucleation from free surfaces. Surface properties such as crystallographic orientation, surface stress, and surface diffusion have been proposed as key parameters that control dislocation surface nucleation, but have not been confirmed experimentally. To investigate the influence of surface parameters, in situ scanning electron microscope mechanical testing is used to compress defect-free Ag and Cu nanocubes that are passivated with organic surfactants in order to tune their surface properties. Comparison between passivated nanocubes indicates that yield strength may depend on surfactant binding energy, but is also dependent on intrinsic material properties.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 3 , September 2019 , pp. 1029 - 1033
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

*

These authors contributed equally to this work.

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