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Description of the superplastic flow process by deformation mechanism maps in ultrafine-grained materials

Title
Description of the superplastic flow process by deformation mechanism maps in ultrafine-grained materials
Author
Kawasaki, Megumi
Keywords
Deformation mechanism map; Equal-channel angular pressing; Flow processes; Highpressure torsion; Superplasticity
Issue Date
2016-01
Publisher
Trans Tech Publications Inc.
Citation
Materials Science Forum, v. 838-839, Page. 51-58
Abstract
The synthesis of ultrafine-grained (UFG) materials is very attractive because small grains lead to excellent creep properties including superplastic ductility at elevated temperatures. Severe plastic deformation (SPD) is an attractive processing technique for refining microstructures of metallic materials to have ultrafine grain sizes within the submicrometer to even the nanometer level. Among the SPD techniques, most effective processing is conducted through equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) and there are numerous reports demonstrating the improved tensile properties at elevated temperature. This report demonstrates recent results on superplasticity in metals after ECAP and HPT. Moreover, superplastic flow of the UFG materials is evaluated by using flow mechanisms developed earlier for coarse-grained materials and depicted by plotting deformation mechanism maps which provide excellent visual representations of flow properties over a wide range of testing conditions. © 2016 Trans Tech Publications, Switzerland.
URI
https://www.scientific.net/MSF.838-839.51http://hdl.handle.net/20.500.11754/31708
ISBN
978-303835672-1
ISSN
1662-9752
DOI
10.4028/www.scientific.net/MSF.838-839.51
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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