Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics
Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics
Plastic deformation by grain boundary sliding in superplastic alloys is described by a novel thermostatistical approach. The Gibbs free energy for cavity formation at moving grain boundaries is obtained. It equals the competition between the stored energy at the boundaries and the energy dissipated by grain boundary sliding. The latter is approximated by an entropy term induced by moving dislocations to facilitate boundary displacement. Strength loss evolution is estimated from the cavity evolution rate. The theory describes superplastic behaviour of Zn22Al, Zn21Al2Cu and Mg3Al1Zn for various temperatures, strain rates, grain sizes, and specimen geometries. Transition maps are defined for finding the optimal conditions for achieving superplastic behaviour in terms of composition, temperature, geometry and strain rate.
Alloy design, Cavitation, Dislocations, Grain boundary sliding, Superplasticity, Themostatistics
677-687
Galindo-Nava, E.I.
55a2bf00-0903-414e-8ab6-e26d143a9af3
Torres-Villaseñor, G.
1a51b36c-2593-4cd3-8d26-bfd892336d89
Rivera-Díaz-Del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
1 April 2015
Galindo-Nava, E.I.
55a2bf00-0903-414e-8ab6-e26d143a9af3
Torres-Villaseñor, G.
1a51b36c-2593-4cd3-8d26-bfd892336d89
Rivera-Díaz-Del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Galindo-Nava, E.I., Torres-Villaseñor, G. and Rivera-Díaz-Del-Castillo, P.E.J.
(2015)
Engineering grain boundary sliding and cavitation effects in superplastic alloys employing thermodynamics.
Materials Science and Technology (United Kingdom), 31 (6), .
(doi:10.1179/1743284714Y.0000000643).
Abstract
Plastic deformation by grain boundary sliding in superplastic alloys is described by a novel thermostatistical approach. The Gibbs free energy for cavity formation at moving grain boundaries is obtained. It equals the competition between the stored energy at the boundaries and the energy dissipated by grain boundary sliding. The latter is approximated by an entropy term induced by moving dislocations to facilitate boundary displacement. Strength loss evolution is estimated from the cavity evolution rate. The theory describes superplastic behaviour of Zn22Al, Zn21Al2Cu and Mg3Al1Zn for various temperatures, strain rates, grain sizes, and specimen geometries. Transition maps are defined for finding the optimal conditions for achieving superplastic behaviour in terms of composition, temperature, geometry and strain rate.
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Accepted/In Press date: 5 August 2014
Published date: 1 April 2015
Keywords:
Alloy design, Cavitation, Dislocations, Grain boundary sliding, Superplasticity, Themostatistics
Identifiers
Local EPrints ID: 492432
URI: http://eprints.soton.ac.uk/id/eprint/492432
ISSN: 0267-0836
PURE UUID: 52092f29-ce45-4fa5-91c3-fc4041f4c946
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Date deposited: 26 Jul 2024 16:40
Last modified: 27 Jul 2024 02:08
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Contributors
Author:
E.I. Galindo-Nava
Author:
G. Torres-Villaseñor
Author:
P.E.J. Rivera-Díaz-Del-Castillo
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