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Identification and rationalization of secondary twin variants in a magnesium alloy
conference contribution
posted on 2008-01-01, 00:00 authored by Matthew BarnettMatthew Barnett, Pavel CizekPavel CizekThe 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.
History
Event
International Conference on Textures of Materials (15th : 2008 : Pittsburgh, Pa.)Pagination
1 - 10Publisher
WileyLocation
Pittsburgh, PennsylvaniaPlace of publication
Hoboken, N.J.Start date
2008-06-01End date
2008-06-06ISBN-13
9780470408346ISBN-10
0470408340Language
engPublication classification
E1 Full written paper - refereed; E Conference publicationCopyright notice
2009, WileyEditor/Contributor(s)
A Rollett, B Adams, K Barmak, T BielerTitle of proceedings
ICOTOM 2008 : Proceedings of the 15th International Conference on Textures of Materials (ICOTOM 15)Usage metrics
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