Plastic behaviour of quasicrystals and related intermetallic phases [Elektronische Ressource] / vorgelegt von Marc Heggen

Plastic behaviour of quasicrystals and related intermetallic phases Von der Fakultät für Mathematik, Informatik und Naturwissenschaften der Rheinisch-Westfälischen Technischen Hochschule Aachen zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften genehmigte Dissertation vorgelegt von Diplom-Physiker Marc Heggen aus Mönchengladbach Berichter: Universitätsprofessor Dr. K. Urban Universitätsprofessor Dr. J. Mayer Tag der mündlichen Prüfung: 16. Oktober 2003 Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar. Abstract In the present work, the plasticity of quasicrystals, metallic glasses and structurally complex alloy phases was investigated. The concepts of plasticity for simple crystalline materials cannot be applied to these materials without substational modification. Plastic deformation experiments and subsequent microstructural investigations by means of transmission electron microscopy (TEM) were performed on icosahedral Zn-Mg-Dy and Al-Pd-Mn single quasicrystals. A constitutive model approach describing the plasticity of icosahedral quasicrystals was applied to a wide range of experimental deformation parameters. In both materials plastic deformation depends on the interaction of dislocation storage and recovery and the strain driven disordering and diffusion driven reordering of the material.