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Title: Dislocation and Stacking Fault Core Fields in FCC Metals

Abstract

Atomistic models were used to determine the properties of dislocation core fields and stacking fault fields in Al and Cu using embedded atom method (EAM) potentials. Long-range, linear elastic displacement fields due to nonlinear behavior within dislocation cores, the core field, for relevant combinations of Shockley partial dislocations for edge, screw, and mixed (60° and 30°) geometries were obtained. Displacement fields of stacking faults were obtained separately and used to partition the core field of dissociated dislocations into core fields of partial dislocations and a stacking fault expansion field. Core field stresses were derived from which the total force, including the Volterra field plus core field, between dislocations for several dislocation configurations was determined. The Volterra field dominates when the distance between dislocations exceeds about 50b but forces due to core fields are important for smaller separation distances and were found to affect the equilibrium angle of edge dislocation dipoles and to contribute to the force between otherwise non-interacting edge and screw dislocations. Interactions among the components of a dissociated dislocation modify the equilibrium separation for Shockley partials suggesting that methods that determine stacking fault energies using measurements of separation distances should include core fields.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
876872
Report Number(s):
PNNL-SA-42367
KC0201020; TRN: US200608%%327
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Philosophical Magazine A, 85(36):4477-4508; Journal Volume: 85; Journal Issue: 36
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMS; DIPOLES; DISLOCATIONS; EDGE DISLOCATIONS; SCREW DISLOCATIONS; STACKING FAULTS; STRESSES

Citation Formats

Henager, Charles H, and Hoagland, Richard G. Dislocation and Stacking Fault Core Fields in FCC Metals. United States: N. p., 2005. Web. doi:10.1080/14786430500300181.
Henager, Charles H, & Hoagland, Richard G. Dislocation and Stacking Fault Core Fields in FCC Metals. United States. doi:10.1080/14786430500300181.
Henager, Charles H, and Hoagland, Richard G. Wed . "Dislocation and Stacking Fault Core Fields in FCC Metals". United States. doi:10.1080/14786430500300181.
@article{osti_876872,
title = {Dislocation and Stacking Fault Core Fields in FCC Metals},
author = {Henager, Charles H and Hoagland, Richard G},
abstractNote = {Atomistic models were used to determine the properties of dislocation core fields and stacking fault fields in Al and Cu using embedded atom method (EAM) potentials. Long-range, linear elastic displacement fields due to nonlinear behavior within dislocation cores, the core field, for relevant combinations of Shockley partial dislocations for edge, screw, and mixed (60° and 30°) geometries were obtained. Displacement fields of stacking faults were obtained separately and used to partition the core field of dissociated dislocations into core fields of partial dislocations and a stacking fault expansion field. Core field stresses were derived from which the total force, including the Volterra field plus core field, between dislocations for several dislocation configurations was determined. The Volterra field dominates when the distance between dislocations exceeds about 50b but forces due to core fields are important for smaller separation distances and were found to affect the equilibrium angle of edge dislocation dipoles and to contribute to the force between otherwise non-interacting edge and screw dislocations. Interactions among the components of a dissociated dislocation modify the equilibrium separation for Shockley partials suggesting that methods that determine stacking fault energies using measurements of separation distances should include core fields.},
doi = {10.1080/14786430500300181},
journal = {Philosophical Magazine A, 85(36):4477-4508},
number = 36,
volume = 85,
place = {United States},
year = {Wed Dec 21 00:00:00 EST 2005},
month = {Wed Dec 21 00:00:00 EST 2005}
}