The development of superplasticity and deformation mechanism maps in an ultrafine-grained magnesium alloy
The development of superplasticity and deformation mechanism maps in an ultrafine-grained magnesium alloy
Magnesium alloys with refined grain structure are often superplastic at elevated temperatures with maximum elongations up to more than 1000%. The superplastic behavior of this material agrees with deformation by grain boundary sliding. Dislocation climb becomes the rate controlling mechanism at higher stresses but the rate controlling mechanism at lower stresses is not fully documented. This report examines the development of superplasticity in a magnesium ZK60 alloy and shows that an increase in stress exponent and decrease in elongation takes place at low stresses. Deformation mechanism maps are constructed considering Regions I, II and III and Coble creep.
48-53
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
January 2017
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi, Figueiredo, Roberto B. and Langdon, Terence G.
(2017)
The development of superplasticity and deformation mechanism maps in an ultrafine-grained magnesium alloy.
Materials Science Forum, 879, .
(doi:10.4028/www.scientific.net/MSF.879.48).
Abstract
Magnesium alloys with refined grain structure are often superplastic at elevated temperatures with maximum elongations up to more than 1000%. The superplastic behavior of this material agrees with deformation by grain boundary sliding. Dislocation climb becomes the rate controlling mechanism at higher stresses but the rate controlling mechanism at lower stresses is not fully documented. This report examines the development of superplasticity in a magnesium ZK60 alloy and shows that an increase in stress exponent and decrease in elongation takes place at low stresses. Deformation mechanism maps are constructed considering Regions I, II and III and Coble creep.
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Accepted/In Press date: 23 September 2016
e-pub ahead of print date: 15 November 2016
Published date: January 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 402936
URI: http://eprints.soton.ac.uk/id/eprint/402936
ISSN: 1662-9752
PURE UUID: 77fe3ca1-89ab-476b-8e2c-6d23f72b5ee2
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Date deposited: 18 Nov 2016 15:21
Last modified: 16 Mar 2024 03:28
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Author:
Megumi Kawasaki
Author:
Roberto B. Figueiredo
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