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

Mungole, Tarang and Kumar, Praveen and Kawasaki, Megumi and Langdon, Terence G (2015) The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility. In: JOURNAL OF MATERIALS SCIENCE, 50 (10). pp. 3549-3561.

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Official URL: http://dx.doi.org/10.1007/s10853-015-8915-2

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 x 10(-4) to 1.0 x 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.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Keywords: SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; ATOMIC-FORCE MICROSCOPY; RESOLUTION ELECTRON-MICROSCOPY; SUPERPLASTIC FLOW; ROOM-TEMPERATURE; AL-ALLOY; METALS; BEHAVIOR; SHEAR
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 23 Apr 2015 07:37
Last Modified: 23 Apr 2015 07:37
URI: http://eprints.iisc.ac.in/id/eprint/51351

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