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Low temperature dislocation mechanisms in ordered and disordered Cu3Au

Low temperature dislocation mechanisms in ordered and disordered Cu3Au
Low temperature dislocation mechanisms in ordered and disordered Cu3Au
The temperature and strain rate dependence of the flow stress of ordered and disordered polycrystalline Cu3Au was investigated in the range 20°–420°K. A thermally activated deformation mechanism was observed at temperatures less than ∼100°K and ∼340°K for the ordered and disordered material respectively. For ordered Cu3Au, the experimental data were shown to correlate well with the requirements of the Peierls mechanism over the entire thermally activated region; for the disordered material, good agreement was only obtained at temperatures less than ∼120°K, and it appeared that deformation was by the intersection mechanism in the temperature range ∼220°–340°K.

It is suggested that a pseudo-Peierls mechanism occurs in ordered Cu3Au at temperatures less than ∼100°K, and in disordered Cu3Au at temperatures less than ∼120°K, due to splitting of the cores of screw dislocations on several planes.
0141-8610
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Dorn, John E.
3063f7c9-4dbc-4173-a66f-d5c1bca28597
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Dorn, John E.
3063f7c9-4dbc-4173-a66f-d5c1bca28597

Langdon, Terence G and Dorn, John E. (1967) Low temperature dislocation mechanisms in ordered and disordered Cu3Au. Philosophical Magazine, 17 (149). (doi:10.1080/14786436808223179). (In Press)

Record type: Article

Abstract

The temperature and strain rate dependence of the flow stress of ordered and disordered polycrystalline Cu3Au was investigated in the range 20°–420°K. A thermally activated deformation mechanism was observed at temperatures less than ∼100°K and ∼340°K for the ordered and disordered material respectively. For ordered Cu3Au, the experimental data were shown to correlate well with the requirements of the Peierls mechanism over the entire thermally activated region; for the disordered material, good agreement was only obtained at temperatures less than ∼120°K, and it appeared that deformation was by the intersection mechanism in the temperature range ∼220°–340°K.

It is suggested that a pseudo-Peierls mechanism occurs in ordered Cu3Au at temperatures less than ∼100°K, and in disordered Cu3Au at temperatures less than ∼120°K, due to splitting of the cores of screw dislocations on several planes.

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Accepted/In Press date: 16 October 1967

Identifiers

Local EPrints ID: 488086
URI: http://eprints.soton.ac.uk/id/eprint/488086
ISSN: 0141-8610
PURE UUID: 7b54a61d-a802-4032-8bcd-303320376867
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 15 Mar 2024 17:34
Last modified: 18 Mar 2024 02:56

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Author: John E. Dorn

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