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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Description/Abstract
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 |
|---|---|
| ISSNs: | 0921-5093 |
| Subjects: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Faculty of Engineering and the Environment > Engineering Sciences > Bioengineering Research Group |
| Item ID: | 335078 |
| Date Deposited: | 14 Mar 2012 09:02 |
| Last Modified: | 19 Jul 2012 13:09 |
| Contributors: | Kawasaki, Megumi (Author) Balasubramanian, N. (Author) Langdon, Terence G. (Author) |
| Date: | 15 August 2011 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/335078 |
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