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Dislocation Behavior During Deformation- Combining Experiments, Simulation and Modeling.

Published online by Cambridge University Press:  15 February 2011

I.M. Robertson ,
J. Robach ,
B. Wirth ,
A. Arsenlis  and
Lawrence Livermore
I.M. Robertson
Affiliation:
Dept. of Mater. Sc. and Engin., Univ. of Illinois, Urbana, IL;
J. Robach
Affiliation:
Dept. of Mater. Sc. and Engin., Univ. of Illinois, Urbana, IL;
B. Wirth
Affiliation:
National laboratory, Livermore, CA.
A. Arsenlis
Affiliation:
National laboratory, Livermore, CA.
Lawrence Livermore
Affiliation:
National laboratory, Livermore, CA.
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Abstract

In situ straining in the transmission electron microscope has been combined with molecular dynamics computer simulations to investigate the nature of the interaction of glissile dislocations with radiation-produced defects (loops, stacking-fault tetrahedra, and He bubbles), and to determine the mechanisms by which the dislocation loops and stacking-fault tetrahedra are annihilated and defect-free channels are created. The defect pinning strength depends on the defect and on the interaction geometry. The experiments and simulations show that a single interaction is not always sufficient to annihilate a dislocation loop or a stacking-fault tetrahedra and that the nature of the defect may be changed because of the interaction. The edge/screw character of the dislocation is also important as they have different efficiencies for annihilating a defect. The dislocations responsible for creating the defect-free channels are not the preexisting dislocations but originate from grain boundaries and other stress concentrators. Cross-slip of dislocations within the channels is important for clearing and widening the channel and can create new channels. Based on these observations a dispersed-barrier hardening model in which the influence of the radiation defects and dislocation density are combined. The resulting model predicts the observed behavior, including the apparent yield drop at high defect densities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 779: Symposium W – Multiscale Phenomena in Materials - Experiments and Modeling Related to Mechanical Behavior , 2003 , W1.5
Copyright
Copyright © Materials Research Society 2003

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