English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Phase-field-based calculations of the disregistry fields of static extended dislocations in FCC metals

Xu, S., Mianroodi, J. R., Hunter, A. G. M., Beyerlein, I. J., & Svendsen, B. (2019). Phase-field-based calculations of the disregistry fields of static extended dislocations in FCC metals. Philosophical Magazine. doi:10.1080/14786435.2019.1582850.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0003-40B1-C Version Permalink: http://hdl.handle.net/21.11116/0000-0003-40B2-B
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Xu, Shuozhi1, Author              
Mianroodi, Jaber Rezaei2, 3, Author              
Hunter, Abigail G. M.4, Author              
Beyerlein, Irene J.1, 5, Author              
Svendsen, Bob6, 7, Author              
Affiliations:
1California NanoSystems Institute, University of California, Santa Barbara, CA, USA, ou_persistent22              
2Material Mechanics, RWTH Aachen University, Schinkelstr. 2, Aachen, Germany, ou_persistent22              
3Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
4Los Alamos National Laboratory, P.O. Box 1663 MS T086, Los Alamos, NM 87545, USA, ou_persistent22              
5Department of Mechanical Engineering, MaterialsDepartment, University of California, Santa Barbara, CA, USA, ou_persistent22              
6Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
7Material Mechanics, Faculty of Georesources and Materials Engineering, RWTH Aachen University, Schinkelstraße 2, D-52062 Aachen, Germany, ou_persistent22              

Content

show
hide
Free keywords: Continuum mechanics; Free energy; Stacking faults, Continuum formulation; Dislocation core structure; Extended dislocations; Intrinsic stacking fault; Molecular statics; Phase fields; Stacking fault energies; Truncated Fourier series, Fourier series
 Abstract: In the continuum context, the displacements of atoms induced by a dislocation can be approximated by a continuum disregistry field. In this work, two phase-field (PF)-based approaches and their variants are employed to calculate the disregistry fields of static, extended dislocations of pure edge and pure screw character in two face-centred cubic metals: Au and Al, which have distinct stable stacking fault energy and elastic anisotropy. A new truncated Fourier series form is developed to approximate the generalised stacking fault energy (GSFE) surface, which shows significant improvement over the previously employed Fourier series form. By measuring the intrinsic stacking fault (ISF) width and partial dislocation core size in different ways, the PF-based disregistry fields are quantitatively compared against those predicted by molecular statics. In particular, two new measures for the ISF widths are proposed and shown to overcome drawbacks of the more commonly used standards in the literature. Our calculations also show that continuum formulation of the elastic energy and the GSFE for a homogeneous surface can successfully characterise the core structure. Last, our comparisons highlight the significance of including the gradient energy in the free energy formulation when an accurate description of the dislocation core structure is desired. © 2019, © 2019 Informa UK Limited, trading as Taylor Francis Group.

Details

show
hide
Language(s): eng - English
 Dates: 2019-02-062019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1080/14786435.2019.1582850
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Philosophical Magazine
  Abbreviation : Philos. Mag.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Milton Park, Abingdon, England : Taylor & Francis
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 1478-6435
CoNE: https://pure.mpg.de/cone/journals/resource/954925265237