An improved dislocation density based work hardening model for al-alloys [Elektronische Ressource] / vorgelegt von Gurla V.S.S. Prasad

An Improved DislocationDensity Based Work HardeningModel for Al-AlloysVon der Fakult¨at fu¨r Georessourcen und Materialtechnikder Rheinisch-Westf¨alischen Technischen Hochschule Aachenzur Erlangung des akademischen Grades einesDoktors der Ingenieurwissenschaftengenehmigte Dissertationvorgelegt von Master of ScienceGurla V.S.S. Prasadaus IndienBerichter: PD Dr. rer.nat. Volker MohlesUniv.-Prof.Dr.rer.nat. Gu¨nter GottsteinTag der mu¨ndlichen Pru¨fung: 16. Februar 2007Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek onlineverfu¨gbarAcknowledgementsI thank my research supervisor Prof. rer nat Gu¨nter Gottstein for his guid-ance and encouragement during the project. I am deeply indebted to PDDr.rer.nat. Volker Mohles for his invaluable guidance, friendly nature andimmense help especially in picking up some key concepts which will help menow and in my future academic career.I would also like to thank Sheila Bhaumik and Talal Al Samman for theirhelp in conducting the experiments. I thank David Beckers for helping mein the metallography lab and Thomas Burlet for setting up the equipmentsin the mechanical testing lab. I would like to thank Mr. Matthias Loeckand Sergej Laiko for their help in setting up my computer and periodicallyhelping me solve some problems related to computations.