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Experimental Mechanics

Erschienen in:

01.04.2009

On the Occurrence of Portevin–Le Châtelier Instabilities in Ultrafine-Grained 5083 Aluminum Alloys

verfasst von: S. P. Joshi, C. Eberl, B. Cao, K. T. Ramesh, K. J. Hemker

Erschienen in: Experimental Mechanics | Ausgabe 2/2009

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Abstract

The Portevin–Le Châtelier (PLC) instability is commonly observed in Al–Mg alloys and is manifested in serrated flow within the stress–strain response. We investigate the persistence of this instability with reduction in grain size by studying an ultrafine-grained (ufg) aluminum alloy (Al5083) and a conventional grain size Al5083. Micro-scale tensile tests combined with digital image correlation (DIC) reveal strength anisotropy and heterogeneity of the deformation in the three material directions (extrusion, rolled, and transverse). For the same applied displacement rate, the PLC effect in ufg-Al5083 is observed only over a small strain range immediately following the yield, while the coarse-grained Al5083 exhibits serrated flow over nearly the entire plastic strain range. These observations are explained using the stability analysis of Hähner (Acta Mater 45:3695–3707, 1997), and implications for nanocrystalline (nc) alloys are discussed.

Vorheriger Artikel In situ Characterization of Nanomechanical Behavior of Free-standing Nanostructures

Nächster Artikel Is Intersonic Dislocation Motion Possible? Singularity Analysis for an Edge Dislocation Accelerating through the Shear Wave Speed Barrier

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Titel: On the Occurrence of Portevin–Le Châtelier Instabilities in Ultrafine-Grained 5083 Aluminum Alloys
verfasst von: S. P. Joshi
C. Eberl
B. Cao
K. T. Ramesh
K. J. Hemker
Publikationsdatum: 01.04.2009
Verlag: Springer US
Erschienen in: Experimental Mechanics / Ausgabe 2/2009
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-008-9208-3

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