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Deformation Behavior of FCC Crystalline Metallic Nanowires Under High Strain Rates

Published online by Cambridge University Press:  10 February 2011

Yue Qi ,
Hideyuki Ikeda ,
Tahir Cagin ,
Konrad Samwer ,
William L. Johnson  and
William A. Goddard
Yue Qi
Affiliation:
Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA
Hideyuki Ikeda
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125, USA
Tahir Cagin
Affiliation:
Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA
Konrad Samwer
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125, USA
William L. Johnson
Affiliation:
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125, USA
William A. Goddard
Affiliation:
Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

We used molecular dynamics (MD) methods to study the deformation behavior of metallic alloy crystal nanowires of pure Cu, NiCu alloy and NiAu alloy, under high rates of uniaxial tensile strain, ranging from 5* 108/s to 5* 10/s. These nanowires are just about 2 nm thick and hence cannot sustain dislocations, instead we find that deformation proceeds through twinning and coherent slipping mechanisms. NiAu has a 13% size mismatch whereas NiCu only 2.5%. As a result the critical strain rate at which the “nanowire crystals” flow like a “liquid” is 100 times smaller for NiAu. We also calculated the elastic constants at each strain state for all strain rates to identify the relation between mechanical “shear” instability and deformation process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 367
Copyright
Copyright © Materials Research Society 1999

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