A microstructure based analytical model for tensile twinning in a rod textured Mg alloy

Barnett, M. R., Bouaziz, O. and Toth, L. S. 2015, A microstructure based analytical model for tensile twinning in a rod textured Mg alloy, International journal of plasticity, vol. 72, pp. 151-167, doi: 10.1016/j.ijplas.2015.05.003.

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Title A microstructure based analytical model for tensile twinning in a rod textured Mg alloy
Author(s) Barnett, M. R.ORCID iD for Barnett, M. R. orcid.org/0000-0001-8287-9044
Bouaziz, O.
Toth, L. S.
Journal name International journal of plasticity
Volume number 72
Start page 151
End page 167
Total pages 17
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-06-25
ISSN 0749-6419
Keyword(s) A. Twinning
B. Constitutive behaviour
B. Metallic material
C. Analytic functions
Summary Abstract A model for tensile twinning during the compression of rod textured magnesium is developed based on the idea that these twins nucleate at grain boundaries and that when the twin number density per grain is low these twins readily give rise to the formation of other 'interaction' twins in adjacent grains. Experimental observations of twin aspect ratios measured at a single grain size and twin number densities measured over four grain sizes were used to determine model material parameters. Using these, the model provides reasonable predictions for the observed magnitudes and trends for the following observations:Effect of grain size and stress on twin volume fraction, fractional twin length and the fraction of twin contact.Effect of grain size on the yield stress.Effect of grain size on the general shape of the stress-strain curve at low strains. A parametric study shows the model to be quite robust but that it is particularly sensitive to the value of the exponent assumed for the twin nucleation rate law. It is seen that preventing the formation of interaction twins provides an important avenue for hardening and that the flow stress is also particularly sensitive to the relaxation of the twin back stresses. The model shows the importance of taking microstructure into account when modelling twinning.
Language eng
DOI 10.1016/j.ijplas.2015.05.003
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30077291

Document type: Journal Article
Collections: Institute for Frontier Materials
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