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On the strength of dislocation interactions and their effect on latent hardening in pure Magnesium

Bertin,N, Tome,CN, Beyerlein,IJ, Barnett,MR and Capolungo,L 2014, On the strength of dislocation interactions and their effect on latent hardening in pure Magnesium, International Journal of Plasticity, vol. 62, pp. 72-92, doi: 10.1016/j.ijplas.2014.06.010.

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Title On the strength of dislocation interactions and their effect on latent hardening in pure Magnesium
Author(s) Bertin,N
Tome,CN
Beyerlein,IJ
Barnett,MRORCID iD for Barnett,MR orcid.org/0000-0001-8287-9044
Capolungo,L
Journal name International Journal of Plasticity
Volume number 62
Start page 72
End page 92
Total pages 21
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-11-01
ISSN 0749-6419
Keyword(s) Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
Dislocations
Constitutive behaviour
SLIP SYSTEMS INTERACTIONS
CLOSE-PACKED METALS
CRYSTAL PLASTICITY
DYNAMICS SIMULATIONS
CONSTITUTIVE MODEL
SINGLE-CRYSTALS
DEFORMATION
MECHANISMS
TEMPERATURE
EVOLUTION
Summary This study is dedicated to the quantification of latent hardening and its effect on the plasticity of pure hexagonal magnesium. To this end, discrete dislocation dynamics simulations are used to (1) extract latent hardening parameters coupling different slip systems, and to (2) assess the validity of two existing constitutive models linking slip system strength to dislocation densities on all slip systems. As hexagonal materials deform via activation of different slip modes, each with different mobilities and lattice friction stress, the effects of the latter on latent hardening evolution are also investigated. It is found that the multi-slip formulation proposed by Franciosi and Zaoui gives accurate predictions when multiple interactions are involved while the formulation suggested by Lavrentev and Pokhil systematically overestimates the flow stress. Similar to FCC materials, it is also found that collinear interactions potentially contribute the most to latent hardening. Basal/pyramidal c + a interactions are found to be very strong, while interactions involving second-order pyramidal c + a primary dislocations appear to be the weakest ones. Finally, the latent hardening parameters, extracted from the discrete dislocation dynamics simulations, are used in polycrystal simulations and the impact of finely accounting for latent hardening on predictions of the macroscopic anisotropic response is shown to be of significant importance.
Language eng
DOI 10.1016/j.ijplas.2014.06.010
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070959

Document type: Journal Article
Collection: Institute for Frontier Materials
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