Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity

Kawasaki, Megumi, Balasubramanian, N. and Langdon, Terence G. (2011) Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 528, (21), 6624-6629. (doi:10.1016/j.msea.2011.05.005).


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An analysis was conducted to examine the flow behavior of ultrafine-grained (UFG) metals produced by severe plastic deformation (SPD) processing in equal-channel angular pressing. The results reveal two distinct types of behavior. At elevated temperatures, the analysis shows that superplastic flow is accurately described by the theoretical mechanism developed for coarse-grained metals so that flow in UFG materials may be interpreted using conventional flow mechanisms. By contrast, localized small-scale grain boundary sliding is observed during deformation at low temperatures and this is attributed to the movement of extrinsic dislocations in the non-equilibrium grain boundaries produced by SPD processing

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.msea.2011.05.005
ISSNs: 0921-5093
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions : Faculty of Engineering and the Environment > Engineering Sciences > Bioengineering Research Group
ePrint ID: 335078
Accepted Date and Publication Date:
14 May 2011Made publicly available
15 August 2011Published
Date Deposited: 14 Mar 2012 09:02
Last Modified: 31 Mar 2016 14:24
URI: http://eprints.soton.ac.uk/id/eprint/335078

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