Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 459, Issue 1-2, Pages 251-261Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.01.028
Keywords
strain-gradient plasticity; size effects; Hall-Petch relation; nanoindentation
Ask authors/readers for more resources
By considering an interface energy term in gradient plasticity an interfacial yield criterion, indicating the stress at which the interface begins to deform plastically can be developed. From an experimental point of view interfacial yielding has been observed during nanoindentation on an Fe-2.2weight% Si bi-crystal and a Nb polycrystal. In the present study after illustrating the interaction of a grain boundary with the grain interior for a plastically deforming bi-crystal the theoretically determined interfacial yield stress expression is fit to the nanoindentation data for Fe-2.2% Si and Nb. This fit allows first estimates to be obtained for the internal length, a key material parameter that comes into play in all gradient theories. Based on the predicted values the internal length is physically related to the dislocation source distance. (C) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available