Non-Schmid behaviour during secondary twinning in a polycrystalline magnesium alloy

Barnett, Matthew, Keshavarz, Zohreh, Beer, Aiden and Ma, Xiang 2008, Non-Schmid behaviour during secondary twinning in a polycrystalline magnesium alloy, Acta materialia, vol. 56, no. 1, pp. 5-15.

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Title Non-Schmid behaviour during secondary twinning in a polycrystalline magnesium alloy
Author(s) Barnett, Matthew
Keshavarz, Zohreh
Beer, Aiden
Ma, Xiang
Journal name Acta materialia
Volume number 56
Issue number 1
Start page 5
End page 15
Total pages 11
Publisher Pergamon
Place of publication Oxford, England
Publication date 2008-01
ISSN 1359-6454
1873-2453
Keyword(s) magnesium
twinning
Schmid factor
non-Schmid
Summary The present work combines electron backscattering diffraction and Schmid analysis to investigate secondary twinning in the magnesium alloy Mg–3Al–1Zn. Inspection of the misorientations between the parent and {1011} - {1012} doubly twinned volumes reveals that there are four possible variants. One of these variants (the one that forms a misorientation with the matrix characterized by 38°⟨1210⟩ ) is favoured much more than the others. This variant involves the activation of secondary twinning systems quite inconsistent with Schmid-type behaviour. For the secondary twin to grow significantly it must take on a shape enforced by the primary twin. This is non-optimal for strain compatibility. It is argued that the 38°⟨1210⟩ variant occurs most because it provides the closest match between the primary and secondary twinning planes, thus minimizing the compatibility strain.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2008, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017110

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