Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.actamat.2014.01.014
Title: Micromechanics of tensile twinning in magnesium gleaned from molecular dynamics simulations
Authors: Aghababaei, R.
Joshi, S.P. 
Keywords: Continuum plasticity
Deformation twinning
Magnesium
MD simulations
Micromechanics
Issue Date: 2014
Citation: Aghababaei, R., Joshi, S.P. (2014). Micromechanics of tensile twinning in magnesium gleaned from molecular dynamics simulations. Acta Materialia 69 : 326-342. ScholarBank@NUS Repository. https://doi.org/10.1016/j.actamat.2014.01.014
Abstract: This work discusses coarse-grained micromechanics of tensile twinning in magnesium (Mg) extracted from molecular dynamics (MD) simulations. We perform MD simulations on Mg single crystal orientations with initial idealized defect structures at temperatures T=5K and 300K. A detailed atomistic analysis reveals that tensile loading along the c-axis of a defective crystal causes an initial incomplete slip ahead of the defect on the first-order pyramidal 〈c+aâŒplanes, followed by the formation of a {112̄1} twin embryo and basal dislocation. These mechanisms aid the formation of {101̄2} twins, which evolve rapidly while {112̄1} twins disappear. We present a micromechanics picture of the deformation-induced twin structure evolution that is tracked by incorporating a twin orientation analysis (TOA) scheme within Open Visualization Tool. The functional dependencies of the volume fraction (v.f.) and number of twins on the overall plastic strain extracted from this analysis provide a basis to construct kinetic laws for twin evolution in terms of nucleation, growth and coalescence. Preliminary results indicate that {101̄2} v.f. evolution is dominated by twin growth in the presence of defects at room temperature, and it may not be strongly rate dependent. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Source Title: Acta Materialia
URI: http://scholarbank.nus.edu.sg/handle/10635/85409
ISSN: 13596454
DOI: 10.1016/j.actamat.2014.01.014
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

19
checked on Dec 6, 2018

WEB OF SCIENCETM
Citations

19
checked on Nov 27, 2018

Page view(s)

26
checked on Oct 26, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.