Sensitivity of deformation twinning to grain size in titanium and magnesium

Ghaderi, Alireza and Barnett, Matthew R. 2011, Sensitivity of deformation twinning to grain size in titanium and magnesium, Acta materialia, vol. 59, no. 20, pp. 7824-7839.

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Title Sensitivity of deformation twinning to grain size in titanium and magnesium
Author(s) Ghaderi, Alireza
Barnett, Matthew R.
Journal name Acta materialia
Volume number 59
Issue number 20
Start page 7824
End page 7839
Total pages 16
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2011-12
ISSN 1359-6454
1873-2453
Keyword(s) twinning
grain size
titanium
magnesium
Summary The impact of grain size on deformation twinning in commercial purity titanium and magnesium alloy Mg–3Al–1Zn (AZ31) is investigated. Tensile tests were carried out for the titanium samples; compression testing was employed for the magnesium specimens. Average values of the true twin length, true twin thickness and the number density of twins were determined using stereology. A key difference between these two materials is that twinning contributes little to the plastic strain in the titanium while it accounts for nearly all of the early plastic strain in the magnesium. In some respects (e.g. volume fraction and number density) the phenomenology of twinning differed between the two materials, while in others (e.g. twin shape and size) both materials showed a similar response. It is found that in both materials, twins span the entirety of their parent grains only for grain sizes less than ∼30 μm. Both the nucleation density per unit of nucleating interface (i.e. grain and twin boundaries) and the aspect ratio of twins scale with applied stress. The impact of grain size on twin volume fraction is modelled analytically.
Language eng
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
Copyright notice ©2011, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044437

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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