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Molecular Dynamic Computer Simulation of Elastic and Plastic Behavior of Nanophase Ni

Published online by Cambridge University Press:  10 February 2011

H. Van Swygenhoven  and
A. Caro
H. Van Swygenhoven
Affiliation:
Paul Scherrer Institute, Villigen, CH-5236Switzerland, [email protected]
A. Caro
Affiliation:
Centro Atomico Bariloche, 8400 Bariloche, Argentina, [email protected]
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Abstract

Molecular dynamics computer simulations of low temperature elastic and plastic deformation of Ni nanophase samples with several mean grain size in the range 3–5 nm are reported. The samples are polycrystals nucleated from different seeds, with random locations and orientations. Bulk and Young modulus are calculated from stress-strain curves and the onsett of plastic deformation is discussed. At higher loads substantial difference in the plastic behaviour with respect to the coarse grain counterpart is observed: among the mechanism responsible for the deformation, grain boundary sliding and motion, as well as grain rotation are identified. An interpretation in terms of grain boundary viscosity is proposed and a linear dependence of strain rate with the inverse of the grain size is obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 193
Copyright
Copyright © Materials Research Society 1997

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References

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