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Constitutive equations for hot deformation of an Al-6061/20% Al2O3 composite

Constitutive equations for hot deformation of an Al-6061/20% Al2O3 composite
Constitutive equations for hot deformation of an Al-6061/20% Al2O3 composite
The hot deformation response of an Al-6061+20%Al2O3 particulate composite was investigated by means of torsion tests. An analysis of the flow stress dependence on strain rate and temperature gave a stress exponent of n?5.6 and an activation energy of Q?150 kJ mol?1. This value of Q is reasonably close to the anticipated value for self-diffusion in Al. The results are in excellent agreement with other studies carried out on the hot deformation of composites but the phenomenological nature of the constitutive equation does not permit an unambiguous determination of the rate-controlling flow mechanism. Nevertheless, it is shown that an identical constitutive equation may be used to describe the creep of composites under both shear and hot torsion conditions. It is concluded that the mechanism controlling hot deformation and creep at high stresses is the climb of dislocations.
721-725
Spigarelli, S.
caa20975-c35d-4b65-b9b4-5e57d47d0691
Evangelista, E.
eeabb5a5-7dd4-482c-83bd-54618a1e9db0
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Cerri, E
7d35f0a1-3b01-4e30-a5d4-6719cd74adf5
Spigarelli, S.
caa20975-c35d-4b65-b9b4-5e57d47d0691
Evangelista, E.
eeabb5a5-7dd4-482c-83bd-54618a1e9db0
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Cerri, E
7d35f0a1-3b01-4e30-a5d4-6719cd74adf5

Spigarelli, S., Evangelista, E., Langdon, T.G. and Cerri, E (2001) Constitutive equations for hot deformation of an Al-6061/20% Al2O3 composite. Materials Science and Engineering, 319-321, 721-725. (doi:10.1016/S0921-5093(01)01071-1).

Record type: Article

Abstract

The hot deformation response of an Al-6061+20%Al2O3 particulate composite was investigated by means of torsion tests. An analysis of the flow stress dependence on strain rate and temperature gave a stress exponent of n?5.6 and an activation energy of Q?150 kJ mol?1. This value of Q is reasonably close to the anticipated value for self-diffusion in Al. The results are in excellent agreement with other studies carried out on the hot deformation of composites but the phenomenological nature of the constitutive equation does not permit an unambiguous determination of the rate-controlling flow mechanism. Nevertheless, it is shown that an identical constitutive equation may be used to describe the creep of composites under both shear and hot torsion conditions. It is concluded that the mechanism controlling hot deformation and creep at high stresses is the climb of dislocations.

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Published date: December 2001

Identifiers

Local EPrints ID: 23384
URI: http://eprints.soton.ac.uk/id/eprint/23384
PURE UUID: 1d9445a9-2601-43d9-8ffd-c7b9b6e665ea
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 23 Mar 2006
Last modified: 10 Nov 2021 03:06

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Contributors

Author: S. Spigarelli
Author: E. Evangelista
Author: T.G. Langdon ORCID iD
Author: E Cerri

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