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Journal of Materials Science
Erschienen in: Journal of Materials Science 10/2015

01.05.2015 | Original Paper

The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility

verfasst von: Tarang Mungole, Praveen Kumar, Megumi Kawasaki, Terence G. Langdon

Erschienen in: Journal of Materials Science | Ausgabe 10/2015

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Abstract

An as-cast Al–7 % Si alloy was processed by high-pressure torsion (HPT) for up to 10 turns at temperatures of 298 or 445 K. The HPT-processed samples had ultrafine-grained structures and they were tested in tension at room temperature at various strain rates in the range from 1.0 × 10−4 to 1.0 × 10−2 s−1. The contributions of grain boundary sliding (GBS) to the total strain were measured directly using atomic force microscopy. Samples simultaneously showing both high strength and high ductility contained the highest fractions of high-angle grain boundaries (HAGB) and exhibited the highest contributions from GBS, whereas samples showing high strength but low ductility gave negligible values for the sliding contributions. It is concluded that high strength and high ductility require both an ultrafine grain size and a high fraction of HAGB.
Vorheriger Artikel Synthesis, self-assembly, and formation of polymer vesicle hydrogels of thermoresponsive copolymers
Nächster Artikel Magnetic and electrical properties of Ti-substituted lanthanum bismuth manganites

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Fußnoten
1
Since the strain datum points were not infinitesimally close, dσ/dε was approximated as Δσ/Δε where Δε is the difference between the finitely spaced strains over which the values of stress changed by Δσ.
 
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Metadaten
Titel
The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility
verfasst von
Tarang Mungole
Praveen Kumar
Megumi Kawasaki
Terence G. Langdon
Publikationsdatum
01.05.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 10/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-8915-2

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