Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics
Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics
A novel grain size dependent strain hardening model is derived from the theory of irreversible thermodynamics. The model yields the evolution of the dislocation densities in the grain interior and at the grain boundary, as well as their contributions to the flow stress. It is found that submicron grain sizes have a lower dislocation density in the grain interior, causing ductility to decrease greatly. The predicted stress-strain curve shapes, uniform elongation and ultimate tensile strength values for interstitial free steels (body centred cubic) and aluminium alloys (AA1100, face centred cubic) show good agreement with experimental observations.
Ductility, Strength, Thermodynamics, Ultrafine grained alloys, Work hardening modelling
833-839
Huang, M.
af840a99-2fc4-4428-8b90-346a90ded789
Rivera-Díaz-del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Bouaziz, O.
4db4de8c-1a14-4180-91e1-f602311f0727
van der Zwaag, S.
ad11f134-8a43-4635-9feb-7c3d01158f4b
Huang, M.
af840a99-2fc4-4428-8b90-346a90ded789
Rivera-Díaz-del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Bouaziz, O.
4db4de8c-1a14-4180-91e1-f602311f0727
van der Zwaag, S.
ad11f134-8a43-4635-9feb-7c3d01158f4b
Huang, M., Rivera-Díaz-del-Castillo, P.E.J., Bouaziz, O. and van der Zwaag, S.
(2009)
Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics.
Materials Science and Technology, 25 (7), .
(doi:10.1179/174328408X353750).
Abstract
A novel grain size dependent strain hardening model is derived from the theory of irreversible thermodynamics. The model yields the evolution of the dislocation densities in the grain interior and at the grain boundary, as well as their contributions to the flow stress. It is found that submicron grain sizes have a lower dislocation density in the grain interior, causing ductility to decrease greatly. The predicted stress-strain curve shapes, uniform elongation and ultimate tensile strength values for interstitial free steels (body centred cubic) and aluminium alloys (AA1100, face centred cubic) show good agreement with experimental observations.
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e-pub ahead of print date: 1 July 2009
Keywords:
Ductility, Strength, Thermodynamics, Ultrafine grained alloys, Work hardening modelling
Identifiers
Local EPrints ID: 492809
URI: http://eprints.soton.ac.uk/id/eprint/492809
ISSN: 0267-0836
PURE UUID: b9222918-2364-409b-9e4c-d81fd6cecc9a
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Date deposited: 14 Aug 2024 17:02
Last modified: 15 Aug 2024 02:20
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Contributors
Author:
M. Huang
Author:
P.E.J. Rivera-Díaz-del-Castillo
Author:
O. Bouaziz
Author:
S. van der Zwaag
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