submitted by BAŞAR SÜER in partial fulfillment of the requirements for the degree of Doctor of Philosophy i n Metallurgical and Materials Engineering, Middle East Technical University by, Prof. Dr. Naci Emre Altun Dean, Graduate School of Natural and Applied Sciences Prof. Dr. Ali Kalkanlı Head of the Department, Metallurgical and Materials Eng Prof. Dr. Arcan Fehmi Dericioğlu Supervisor, Metallurgical and Materials Eng, METU Prof. Dr. Özlem Aydın Çivi Co-Supervisor, Electrical – Electronics Eng, METU Examining Committee Members: Prof. Dr. Caner Durucan Metallurgical and Materials Engineering, METU Prof. Dr. Arcan Fehmi Dericioğlu Metallurgical and Materials Engineering, METU Prof. Dr. Bora Maviş Mechanical Engineering, Hacettepe大学协会。Metu Assoc的SimgeçınarAygün冶金工程和材料工程教授。教授ÇankayaUniversity博士教授ÇankayaUniversity博士