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Modeling of twin formation, propagation and growth in a Mg single crystal based on crystal plasticity finite element method

Qiao, H., Barnett, M. R. and Wu, P. D. 2016, Modeling of twin formation, propagation and growth in a Mg single crystal based on crystal plasticity finite element method, International journal of plasticity, vol. 86, pp. 70-92, doi: 10.1016/j.ijplas.2016.08.002.

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Title Modeling of twin formation, propagation and growth in a Mg single crystal based on crystal plasticity finite element method
Author(s) Qiao, H.
Barnett, M. R.
Wu, P. D.
Journal name International journal of plasticity
Volume number 86
Start page 70
End page 92
Total pages 23
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-11
ISSN 0749-6419
Keyword(s) Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
Stress relaxation
Twinning
Finite elements
Magnesium
Summary A crystal plasticity finite element method (CPFEM) with a stress relaxation effect for twinning in the constitutive description is employed to simulate twin formation, propagation and growth in Mg single crystals subjected to plane-strain compression along the direction perpendicular to the c-axis of its HCP lattice. Tensile twinning dominates the early stage of plastic deformation and numerical results explicitly show the twinning process including twin formation, propagation and growth. After a twin band (or a narrow twin) is formed, a large gradient of effective stress is found across the band front. Also, the resolved shear stress (RSS) on the twin plane along the twin direction is highly non-homogeneous across the band front. It has been demonstrated that softening facilitates the formation of a twin band and work hardening is contributive to the growth of the twin band. In addition, numerical results indicate that softening plays an important role in the propagation of a twin across a grain boundary with a large misorientation.
Language eng
DOI 10.1016/j.ijplas.2016.08.002
Field of Research 0905 Civil Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30088993

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Wed, 16 Nov 2016, 12:49:01 EST

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