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Title: On the occurrence of Portevin-Le Chêtelier instabilities in ultrafine-grained 5083 aluminum alloys
Authors: Joshi, S.P. 
Eberl, C.
Cao, B.
Ramesh, K.T.
Hemker, K.J.
Keywords: DIC
Grain size
Micro-tensile testing
Portevin-Le Chêtelier instability
Stability analysis
Issue Date: 2009
Citation: Joshi, S.P., Eberl, C., Cao, B., Ramesh, K.T., Hemker, K.J. (2009). On the occurrence of Portevin-Le Chêtelier instabilities in ultrafine-grained 5083 aluminum alloys. Experimental Mechanics 49 (2) : 207-218. ScholarBank@NUS Repository.
Abstract: The Portevin-Le Chêtelier (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. © Society for Experimental Mechanics 2009.
Source Title: Experimental Mechanics
ISSN: 00144851
DOI: 10.1007/s11340-008-9208-3
Appears in Collections:Staff Publications

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