Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate
Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate
Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 ?m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10?4 to ~103 s?1. The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy
367-376
Pereira, Pedro Henrique Rodrigue
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
8 February 2017
Pereira, Pedro Henrique Rodrigue
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Pereira, Pedro Henrique Rodrigue, Wang, Ying Chun, Huang, Yi and Langdon, Terence G.
(2017)
Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate.
Materials Science and Engineering: A, 685, .
(doi:10.1016/j.msea.2017.01.020).
Abstract
Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 ?m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10?4 to ~103 s?1. The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy
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Accepted/In Press date: 6 January 2017
e-pub ahead of print date: 7 January 2017
Published date: 8 February 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 404411
URI: http://eprints.soton.ac.uk/id/eprint/404411
ISSN: 0921-5093
PURE UUID: 7f6a4d1d-fb24-4fc9-832b-4e618c850daa
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Date deposited: 09 Jan 2017 10:04
Last modified: 16 Mar 2024 04:07
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Author:
Pedro Henrique Rodrigue Pereira
Author:
Ying Chun Wang
Author:
Yi Huang
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