A thermostatistical theory of low and high temperature deformation in metals
A thermostatistical theory of low and high temperature deformation in metals
A new theory for describing plastic deformation in metals is presented. The approach focuses on obtaining an expression for the dislocation recovery term in terms of the energy barrier for dislocation annihilation, 〈Δ. G〉. This term is obtained from the contributions of dislocation formation and migration, the statistical entropy inherent to the annihilation process, and the chemical work due to the presence of vacancies. It is shown that at high temperatures, vacancy migration features strongly in dislocation recovery via a climb-assisted process. Employing only input parameters reported in the literature, the theory is able to reproduce experimental stress-strain relationships at temperatures ranging from cryogenic conditions to near-melting temperatures for Cu, Al, Ni and Ag at a variety of strain rates. It is demonstrated that low temperature cross-slip can operate at higher temperatures by increasing the strain rate, and that high temperature dislocation climb can feature at low temperatures by reducing the vacancy migration energy.
Dislocations, Hardening, Non-ferrous alloys, Plasticity
110-116
Galindo-Nava, E.I.
55a2bf00-0903-414e-8ab6-e26d143a9af3
Rivera-Díaz-del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
1 May 2012
Galindo-Nava, E.I.
55a2bf00-0903-414e-8ab6-e26d143a9af3
Rivera-Díaz-del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Galindo-Nava, E.I. and Rivera-Díaz-del-Castillo, P.E.J.
(2012)
A thermostatistical theory of low and high temperature deformation in metals.
Materials Science and Engineering: A, 543, .
(doi:10.1016/j.msea.2012.02.055).
Abstract
A new theory for describing plastic deformation in metals is presented. The approach focuses on obtaining an expression for the dislocation recovery term in terms of the energy barrier for dislocation annihilation, 〈Δ. G〉. This term is obtained from the contributions of dislocation formation and migration, the statistical entropy inherent to the annihilation process, and the chemical work due to the presence of vacancies. It is shown that at high temperatures, vacancy migration features strongly in dislocation recovery via a climb-assisted process. Employing only input parameters reported in the literature, the theory is able to reproduce experimental stress-strain relationships at temperatures ranging from cryogenic conditions to near-melting temperatures for Cu, Al, Ni and Ag at a variety of strain rates. It is demonstrated that low temperature cross-slip can operate at higher temperatures by increasing the strain rate, and that high temperature dislocation climb can feature at low temperatures by reducing the vacancy migration energy.
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Accepted/In Press date: 18 February 2012
e-pub ahead of print date: 28 February 2012
Published date: 1 May 2012
Keywords:
Dislocations, Hardening, Non-ferrous alloys, Plasticity
Identifiers
Local EPrints ID: 492724
URI: http://eprints.soton.ac.uk/id/eprint/492724
ISSN: 0921-5093
PURE UUID: 4f1c67d2-08fe-458b-b3c5-90977bbfb953
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Date deposited: 13 Aug 2024 16:33
Last modified: 14 Aug 2024 02:07
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Contributors
Author:
E.I. Galindo-Nava
Author:
P.E.J. Rivera-Díaz-del-Castillo
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