The rotation axis and rotation angle calculated by the orientation matrix for the {10-12} twinning is the normal of {10-12} and 180 degrees, respectively, which is correct for type I twinning. Here is the question, why do the EBSD give ~86 misorientation? can this value be calculated directly from orientation matrix for this type of twin? Thanks.
Dear Hui,
All twins can be represented using the misorientation angle/axis convention. In the case of hcp materials, the exact misorientation angle varies with the c/a ratio while the axis remains constant.
If you are familiar with Mtex, click on the following weblink to download the code that outputs a plot of the ideal parent-twin misorientation angle versus c/a ratio.
https://groups.google.com/forum/#!topic/mtexmail/eujR6ZEBGxI
Regards,
Azdi
Azdiar A. Gazder in the mtex code are these all for (1012)[1011] twins? how did you calculate them from the n2,k2 etc?
Also have you seen Article A look-up table based approach to characterize crystal twinn...
provides axis angle description for twins in hcp and cubic?- Badges
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