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Phase boundary effects on the mechanical deformation of core/shell Cu/Ag nanoparticles

Published online by Cambridge University Press:  31 January 2011

Bin Zheng ,
Yi Nong Wang ,
Min Qi  and
Elissa H. Williams
Min Qi*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
Elissa H. Williams
Affiliation:
Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030
*
a) Address all correspondence to this author. e-mail: minqi@dlut.edu.cn
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Abstract

The uniaxial compressive deformation of core/shell-type Cu/Ag nanoparticles and naked Cu nanoparticles were simulated by molecular dynamics, revealing the role of nanophase boundaries in the mechanical deformation. The simulations show that single type of partial dislocations glide across the entire slip planes of the Cu cores, resulting in elongated Cu cores compared with circular Cu cores of naked Cu nanoparticles. The phase boundary is the nucleation source of dislocations, and the ultrahigh atomic level stress of part atoms in the phase boundary can ensure the movement of the single type of dislocations under compressed.

Keywords

Core/shellNanostructureSimulation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2210 - 2214
Copyright
Copyright © Materials Research Society 2009

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