The transition from dislocation climb to viscous glide in creep of solid solution alloys
The transition from dislocation climb to viscous glide in creep of solid solution alloys
There are two distinct and separate classes of creep behavior in metallic solid solution alloys. The mechanism of creep in Class I alloys appears to be some form of dislocation climb process, whereas the mechanism in Class II alloys appears to be a viscous glide process. By making assumptions concerning the nature of the climb and glide processes, and using existing experimental results for an Al-3% Mg alloy, it is shown that, to a, first approximation, the criterion for deformation by viscous glide is given by
Bσ2k2(1-νϒGb3>T2e2cb6
where B ∼ 8 × 1012
1, σ is the applied stress, k is Boltzmann's constant, v is Poisson's ratio, γ is the stacking fault energy, G is the shear modulus, b is the Burgers vector, T is the absolute temperature, e is the solute-solvent size difference, and c is the concentration of solute atoms. The creep behavior of twenty-eight different solid solution alloys is analyzed, and it is shown that all alloys except one (Au-10% Ni) give results which are consistent with this criterion for viscous glide.
779-788
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
June 1974
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mohamed, Farghalli A. and Langdon, Terence G.
(1974)
The transition from dislocation climb to viscous glide in creep of solid solution alloys.
Acta Metallurgica et Materialia, 22 (6), .
(doi:10.1016/0001-6160(74)90088-1).
Abstract
There are two distinct and separate classes of creep behavior in metallic solid solution alloys. The mechanism of creep in Class I alloys appears to be some form of dislocation climb process, whereas the mechanism in Class II alloys appears to be a viscous glide process. By making assumptions concerning the nature of the climb and glide processes, and using existing experimental results for an Al-3% Mg alloy, it is shown that, to a, first approximation, the criterion for deformation by viscous glide is given by
Bσ2k2(1-νϒGb3>T2e2cb6
where B ∼ 8 × 1012
1, σ is the applied stress, k is Boltzmann's constant, v is Poisson's ratio, γ is the stacking fault energy, G is the shear modulus, b is the Burgers vector, T is the absolute temperature, e is the solute-solvent size difference, and c is the concentration of solute atoms. The creep behavior of twenty-eight different solid solution alloys is analyzed, and it is shown that all alloys except one (Au-10% Ni) give results which are consistent with this criterion for viscous glide.
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Accepted/In Press date: 26 November 1973
Published date: June 1974
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Local EPrints ID: 489067
URI: http://eprints.soton.ac.uk/id/eprint/489067
ISSN: 0956-7151
PURE UUID: 1d2265f4-f6c6-4d25-95ee-3b204bbab398
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Date deposited: 12 Apr 2024 16:32
Last modified: 13 Apr 2024 01:38
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Author:
Farghalli A. Mohamed
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