Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
- Title
- Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
- Author
- Megumi Kawasaki
- Keywords
- Equal-channel angular pressing; Flow mechanisms; Grain boundary sliding; Superplasticity; Ultrafine-grained metals
- Issue Date
- 2011-08
- Publisher
- ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 권: 528, 호: 21, 페이지: 6624-6629
- 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. (C) 2011 Elsevier B.V. All rights reserved.
- URI
- http://www.sciencedirect.com/science/article/pii/S0921509311005429?via%3Dihubhttp://hdl.handle.net/20.500.11754/37829
- ISSN
- 0921-5093
- DOI
- 10.1016/j.msea.2011.05.005
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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