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

journal contribution
posted on 2016-11-01, 00:00 authored by H Qiao, Matthew BarnettMatthew Barnett, P D Wu
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.

History

Journal

International journal of plasticity

Volume

86

Pagination

70 - 92

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0749-6419

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2016, Elsevier Ltd.