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Deformation and Coble Creep of Nanocrystalline Materials

Published online by Cambridge University Press:  11 February 2011

C.S. Pande  and
R. A. Masumura
C.S. Pande
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375–5343, USA.
R. A. Masumura
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375–5343, USA.
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Abstract

Modeling of strengthening by nanocrystalline materials need consideration of dislocation interactions and sliding due to Coble creep, both of which may be acting simultaneously. Such a mechanism is considered in this paper. It is shown that a model based on using Coble creep (with a threshold stress) for finer grains and conventional Hall-Petch strengthening for larger grains, appears to be most successful in explaining experimental results provided care is taken to incorporate into the analysis the effect of grain size distribution occurring in most specimens. A generalized expression relating yield stress to grain size is also proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I1.1
Copyright
Copyright © Materials Research Society 2003

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