On nucleation and propagation of PLC bands in an Al–3Mg alloy |
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Authors: | L Casarotto H Dierke R Tutsch H Neuhuser |
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Affiliation: | aInsitut für Produktionsmesstechnik, Technische Universität Braunschweig, Schleinitzstr. 20, 38106 Braunschweig, Germany;bInstitut für Physik der Kondensierten Materie, Technische Universität Braunschweig, Germany |
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Abstract: | The processes of nucleation and propagation of Portevin–LeChatelier deformation bands during tensile deformation of the alloy AA5754 have been investigated by a special optical technique for local strain measurements, combining both a line-scan and a CMOS camera to record the changes of surface strain, applying digital image correlation. Examples for bands of types A and B are observed and discussed with respect to the micro-mechanisms of their nucleation and propagation, emphasizing local stress concentrations in addition to the well-known effects of dynamic strain aging and dislocation interactions for explaining the PLC behavior. Finally the nucleation and propagation of PLC bands are simulated by computations based on a simple constitutive model. |
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Keywords: | Portevin– LeChatelier effect Deformation bands Digital image correlation Localization of plastic deformation Plastic instabilities |
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