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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology



Thursday, 16 December 2010
(at 13:00 in room 115, Hallwachsstr. 3)
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Mechanical strength of Copper-alloys

Jens Freudenberger

Institute for Metallic Materials
Leibniz Institute for Solid State and Materials Research Dresden
  Germany  






The mechanical strength of highly strengthened Cu-based conductor materials is strongly related to their microstructure, which in turn is a consequence of the history of processing. Hence, the strength is understood in terms of solid solution, precipitation, grain boundary as well as work hardening. However, there are limitations for strengthening the material by the use of these mechanisms and retaining a reasonable conductivity. Twin boundaries have been shown to strengthen thin films without reducing the conductivity. This gives rise to investigating the role of the stacking fault energy (SFE) with respect to deformation in order to flatten the path to a 'twin-boundary strengthened' conductor. During deformation the SFE controls the possibility of storing deformation energy in the form of dislocations and deformation twins. This is additionally affected by the temperature since dislocation slip is less pronounced at lower temperatures, thus enhancing deformation twinning. The onset of twinning is reflected by the starting point of stacking fault growth, which will be shown exemplarily for a FeMnNiCr steel with a low SFE. For this case, a model-compatible description of the mechanical behaviour is shown and a reasonable SFE is backward calculated upon tensile test data.

Brief Bio:

Jens Freudenberger hat Physik an der Johann Wolfgang von Goethe Universitaet zu Frankfurt am Main studiert und sein Studium mit einer experimentellen Arbeit zur Kristallzuechtung eines Supraleiters abgeschlossen. Im Anschluss ging er zu Ludwig Schultz an das IFW Dresden um dort eine Doktorabeit ebenfalls in der Physik ueber das Wechselspiel von Supraleitung, Magnetismus und struktureller Unordnung in Seltenerd-Uebergangsmetall Borkarbid Supraleitern anzufertigen. Nach seiner Promotion wechselte er das Arbeitsgebiet und die Fachrichtung und beschaeftigt sich seither mit der Um- und Verformung von metallischen Werkstoffen. Fuer seine Arbeiten wurde er mit dem Innovationspreis des deutschen Kupferinstituts und dem Georg Sachs Preis der deutschen Gesellschaft fuer Materialkunde ausgezeichnet.

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2018.10.24 Mi
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