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Journal of Materials Science
Erschienen in: Journal of Materials Science 12/2014

01.06.2014

Plastic deformation behavior of ultrafine-grained Al–Mg–Sc alloy

verfasst von: N. Kumar, M. Komarasamy, R. S. Mishra

Erschienen in: Journal of Materials Science | Ausgabe 12/2014

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Abstract

Ultrafine-grained (UFG) Al–Mg–Sc alloy was obtained by friction stir processing. The UFG alloy was subjected to uniaxial tensile testing to study the tensile deformation behavior of the alloy. An inhomogeneous yielding (Lüdering phenomenon) was observed in the stress–strain curves of UFG alloy. This deformation behavior was absent in the coarse-grained alloy. The Lüdering phenomenon in UFG alloy was attributed to the lack of dislocations in UFG microstructure. A strong dependence of uniform ductility on the average grain size was exhibited by the UFG alloy. Below a critical grain size (0.5 μm), ductility was very limited. Also, with the decrease in grain size, most of the plastic deformation was observed to be localized in necked region of the tensile samples. The negative strain rate sensitivity (SRS) observed for the UFG alloy was opposite of the SRS values reported for UFG alloys in the literature. Based on activation volume measurement, grain boundary mediated dislocation-based plasticity was concluded to be the micro-mechanism operative during plastic deformation of UFG Al–Mg–Sc alloy.
Vorheriger Artikel Fabrication and characterization of superparamagnetic nanocomposites based on epoxy resin and surface-modified γ-Fe2O3 by epoxide functionalization
Nächster Artikel Symmetrically functionalized diketopyrrolopyrrole with alkylated thiophene moiety: from synthesis to electronic devices applications

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Metadaten
Titel
Plastic deformation behavior of ultrafine-grained Al–Mg–Sc alloy
verfasst von
N. Kumar
M. Komarasamy
R. S. Mishra
Publikationsdatum
01.06.2014
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 12/2014
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-014-8115-5

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