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
|Digital Object Identifier (DOI):||doi:10.1016/j.msea.2011.05.005|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||Faculty of Engineering and the Environment > Engineering Sciences > Bioengineering Research Group
|Date Deposited:||14 Mar 2012 09:02|
|Last Modified:||27 Mar 2014 20:19|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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