I still remember our first meeting at IMDEA Materials Institute and the words they said to me. Since that day, my life took a turn and I started enjoying the research field. Thanks to their support, encouragement, excellent guidance and confidence in me have made it possible to carry out this thesis. It has been an honor and a privilege to have had the chance to work with them and learn from them. My appreciation is immense. I gratefully acknowledge to Prof. Javier Llorca and Prof. José Manuel

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... orralba for giving me the opportunity to complete my thesis at IMDEA Materials Institute, for their support and for giving me sincere advices and valuable opportunities. My most sincere thanks go to Dr. Federico Sket for sharing his knowledge in the field of tomography which has been of great importance for this work. Thanks to him and to Dr. Jon Molina-Aldareguia for their collaboration and for their inspiring, constructive and critical discussions. I would like to thank to Prof. Dr.-Ing. Dierk Raabe for giving me the opportunity to perform my stay at Max-Planck-Institut für Eisenforschung GmbH (MPIE) in Düsseldorf, Germany. I am deeply grateful to Dr. Iván Gutiérrez-Urrutia for his help and fruitful discussions during the stay at MPIE. Thanks are also due to Dr. Stefan Zaefferer, Dr. Anahita Khorashadizadeh and Monika Nellessen for the technical support on the threedimensional electron backscatter diffraction measurements at MPIE.