The portevin-le chatelier effect in Cu3Au
The portevin-le chatelier effect in Cu3Au
Tensile tests were performed on ordered and disordered polycrystalline Cu3Au over a wide temperature range, and serrated stress-strain curves were observed in both the ordered and disordered material at temperatures from ~300 K to ~550 K. Three distinct types of serration (A, B and C) were identified.
For type A serrations, (m + α) was determined as 2.98 for the ordered material and 2.18 for the disordered material, where m and β are the strain exponents for vacancy creation and dislocation multiplication, respectively. The value of m was estimated as ~1.9 from the onset of type B serrations. The activation energies for the onset of types A and B serrations in disordered Cu3Au and of type A serrations in ordered Cu3Au, were close to the appropriate values for vacancy migration. The activation energies for the disappearance of serrated flow were similar to those anticipated for self-diffusion. It is demonstrated that the results are in good agreement with the Cottrell model for dynamic strain ageing.
325-332
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Murty, K. Linga
bbdfb06a-2efa-4cd5-aab1-4c91a950921e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
March 1974
Mohamed, Farghalli A.
0d8f02a9-fb40-4e5a-9222-3aecf3e4a460
Murty, K. Linga
bbdfb06a-2efa-4cd5-aab1-4c91a950921e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mohamed, Farghalli A., Murty, K. Linga and Langdon, Terence G.
(1974)
The portevin-le chatelier effect in Cu3Au.
Acta Metallurgica et Materialia, 22 (3), .
(doi:10.1016/0001-6160(74)90171-0).
Abstract
Tensile tests were performed on ordered and disordered polycrystalline Cu3Au over a wide temperature range, and serrated stress-strain curves were observed in both the ordered and disordered material at temperatures from ~300 K to ~550 K. Three distinct types of serration (A, B and C) were identified.
For type A serrations, (m + α) was determined as 2.98 for the ordered material and 2.18 for the disordered material, where m and β are the strain exponents for vacancy creation and dislocation multiplication, respectively. The value of m was estimated as ~1.9 from the onset of type B serrations. The activation energies for the onset of types A and B serrations in disordered Cu3Au and of type A serrations in ordered Cu3Au, were close to the appropriate values for vacancy migration. The activation energies for the disappearance of serrated flow were similar to those anticipated for self-diffusion. It is demonstrated that the results are in good agreement with the Cottrell model for dynamic strain ageing.
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Accepted/In Press date: 22 June 1973
Published date: March 1974
Identifiers
Local EPrints ID: 489064
URI: http://eprints.soton.ac.uk/id/eprint/489064
ISSN: 0956-7151
PURE UUID: a729d44c-5dce-40de-a7cd-6eb475df95e0
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Date deposited: 12 Apr 2024 16:31
Last modified: 13 Apr 2024 01:38
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Author:
Farghalli A. Mohamed
Author:
K. Linga Murty
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