Identification and rationalization of secondary twin variants in a magnesium alloy

Barnett, M. R. and Cizek, P. 2008, Identification and rationalization of secondary twin variants in a magnesium alloy, in ICOTOM 2008 : Proceedings of the 15th International Conference on Textures of Materials (ICOTOM 15), Wiley, Hoboken, N.J., pp. 1-10.

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Title Identification and rationalization of secondary twin variants in a magnesium alloy
Author(s) Barnett, M. R.
Cizek, P.
Conference name International Conference on Textures of Materials (15th : 2008 : Pittsburgh, Pa.)
Conference location Pittsburgh, Pennsylvania
Conference dates June 1-6 2008
Title of proceedings ICOTOM 2008 : Proceedings of the 15th International Conference on Textures of Materials (ICOTOM 15)
Editor(s) Rollett, A.D Tony
Adams,Brent
Barmak, Katayun
Bieler, Thomas
Publication date 2008
Conference series International Conference on Textures of Materials
Start page 1
End page 10
Total pages xvii, 830 p.
Publisher Wiley
Place of publication Hoboken, N.J.
Summary The present work combines electron backscatter diffraction, transmission electron microscopy and Schmid analysis to investigate secondary twinning in the magnesium alloy Mg-3AI-1Zn. Inspection of the misorientations between the parent matrix and {1011} - {1012} doubly twinned volumes reveals that there are four possible variants. One of these variants characterized by 38°< 1210 > misorientation with the matrix is favoured much more than the others. This variant involves activation of the secondary twinning systems that are quite inconsistent with the Schmid-type behaviour. For the secondary twin to grow significantly it must take on a shape enforced by the primary twin, however, this is not optimal for strain compatibility. It is argued that the 38° < 1210 > variant occurs most frequently because it provides the closest match between the primary and secondaty twinning planes, thus minimizing the compatibility strain. This conjecture is confirmed by the simulations of twin activity m ellipsoidal grains performed using the visco-plastic self-consistent crystal plasticity model.
ISBN 9780470408346
0470408340
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E1 Full written paper - refereed
ERA Research output type E Conference publication
HERDC collection year 2008
Copyright notice ©2009, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30018338

Document type: Conference Paper
Collection: Centre for Material and Fibre Innovation
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