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A critical examination of the paradox of strength and ductility in ultrafine-grained metals

Mungole, Tarang and Kumar, Praveen and Kawasaki, Megumi and Langdon, Terence G (2014) A critical examination of the paradox of strength and ductility in ultrafine-grained metals. In: JOURNAL OF MATERIALS RESEARCH, 29 (21). pp. 2534-2546.

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Official URL: http://dx.doi.org/ 10.1557/jmr.2014.272

Abstract

The paradox of strength and ductility is now well established and denotes the difficulty of simultaneously achieving both high strength and high ductility. This paradox was critically examined using a cast Al-7% Si alloy processed by high-pressure torsion (HPT) for up to 10 turns at a temperature of either 298 or 445 K. This processing reduces the grain size to a minimum of similar to 0.4 mu m and also decreases the average size of the Si particles. The results show that samples processed to high numbers of HPT turns exhibit both high strength and high ductility when tested at relatively low strain rates and the strain rate sensitivity under these conditions is similar to 0.14 which suggests that flow occurs by some limited grain boundary sliding and crystallographic slip. The results are also displayed on the traditional diagram for strength and ductility and they demonstrate the potential for achieving high strength and high ductility by increasing the number of turns in HPT.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the CAMBRIDGE UNIV PRESS, 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 20 Dec 2014 04:07
Last Modified: 20 Dec 2014 04:07
URI: http://eprints.iisc.ac.in/id/eprint/50465

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