Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy
Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy
An artificially aged Al-Zn-Mg alloy with a grain size of ~ 1.3 µm was processed by equal-channel angular pressing (ECAP) and then subjected to dynamic compression at a strain rate of 4000 s-1 in the range from room temperature to 673 K. The results show the n' phase is refined and a n phase is formed during the first pass of ECAP and after further processing 8 passes the GP zones are removed. An ultrafine-grained (UFG) structure with an average grain size of ~200 nm was obtained after 4 passes. It is shown that dynamic compressive deformation assists the precipitation process through precipitate coalescence and by changing the precipitate orientations. The dynamic compressive yield strengths and flow stresses decrease gradually to different degrees with increasing temperature except after ECAP processing for 4 passes where there is thermal stability up to 473 K. The ECAP processing significantly improves the strength of the alloy at elevated temperatures by comparison with the as-received material.
617-625
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Wang, Yangwei
2f401c7a-e220-482d-a11a-79d632d5e0ca
Li, Shukui
cf36cc37-f03a-4b4c-8f34-590354846838
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
27 January 2017
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Wang, Yangwei
2f401c7a-e220-482d-a11a-79d632d5e0ca
Li, Shukui
cf36cc37-f03a-4b4c-8f34-590354846838
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Afifi, Mohamed A., Pereira, Pedro H.R., Wang, Ying Chun, Wang, Yangwei, Li, Shukui and Langdon, Terence G.
(2017)
Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy.
Materials Science and Engineering: A, 684, .
(doi:10.1016/j.msea.2016.12.099).
Abstract
An artificially aged Al-Zn-Mg alloy with a grain size of ~ 1.3 µm was processed by equal-channel angular pressing (ECAP) and then subjected to dynamic compression at a strain rate of 4000 s-1 in the range from room temperature to 673 K. The results show the n' phase is refined and a n phase is formed during the first pass of ECAP and after further processing 8 passes the GP zones are removed. An ultrafine-grained (UFG) structure with an average grain size of ~200 nm was obtained after 4 passes. It is shown that dynamic compressive deformation assists the precipitation process through precipitate coalescence and by changing the precipitate orientations. The dynamic compressive yield strengths and flow stresses decrease gradually to different degrees with increasing temperature except after ECAP processing for 4 passes where there is thermal stability up to 473 K. The ECAP processing significantly improves the strength of the alloy at elevated temperatures by comparison with the as-received material.
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Accepted/In Press date: 22 December 2016
e-pub ahead of print date: 23 December 2016
Published date: 27 January 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 404206
URI: http://eprints.soton.ac.uk/id/eprint/404206
ISSN: 0921-5093
PURE UUID: e51755f3-2aaf-43ce-9b8b-75fe5ae901b3
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Date deposited: 03 Jan 2017 15:42
Last modified: 16 Mar 2024 03:28
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Author:
Mohamed A. Afifi
Author:
Pedro H.R. Pereira
Author:
Ying Chun Wang
Author:
Yangwei Wang
Author:
Shukui Li
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