I am studying wrought plates (no powder) of aluminium alloys with a 
Bragg-Brentano difractometer.  Our patterns are very different from a model 
aluminium pattern without Prefered Orientation or "Grainyness", so I suppose 
that our samples have several very strong Prefered Orientation. Nevertheless 
I required your opinion about the subject, so I can exclude a "grainyness" 
effect.
All the opinions and bibliographical references on the subject will be welcome.
Thank you in advance
Gustavo Cifredo, University of Cadiz, Spain