Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 41: Mechanical Properties II
MM 41.4: Vortrag
Mittwoch, 13. März 2013, 15:45–16:00, H26
Mechanical Spectroscopy on deformed Al-Mg-Si (AA6061) alloy: Characterization of interactions between solute atoms, precipitates and dislocations — •Jens Bernhardt and Hans-Rainer Sinning — Institut für Werkstoffe, Technische Universität Braunschweig, Germany
Industrially used alloy AA 6061 shows a great variety of microstructural effects. In homogenized samples formation of solute clusters starts during storing at room temperature (RT). At higher temperatures a complex precipitation sequence takes place changing microstructural state and therefore mechanical properties of the alloy. In addition mobility of solute atoms is increasing with increasing temperature. Since dynamics of dislocations are governed by microstructural material state and by interaction with solute atoms, characteristics of dislocation dynamics are changing with temperature. In order to investigate the interaction of dislocations with precipitates and solute atoms, temperature dependent internal friction (TDIF) between 80 and 292 K was measured, after different thermal treatments and plastic deformation at 80 K and 292 K respectively, using the vibrating-reed technique with small strain amplitudes between about 10−6 and 10−5. Interaction between solute atoms and dislocations can also be affected by these small strains, hence TDIF was measured at both high (10−5) and low (10−6) strain amplitude. The results are discussed regarding applied deformation, strain amplitude and thermal treatment in order to characterize the dynamics of dislocations in AA 6061 and related aspects of the Portevin-Le Chatelier effect.