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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
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 um 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.
0921-5093
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
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, pp. 617-625. (doi:10.1016/j.msea.2016.12.099).

Record type: Article

Abstract

An artificially aged Al-Zn-Mg alloy with a grain size of ~ 1.3 um 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.

Text __filestore.soton.ac.uk_users_yh2a10_mydocuments_Yingchun-MSEA-December2016.pdf - Accepted Manuscript
Restricted to Repository staff only until 23 December 2017.

More information

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
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 03 Jan 2017 15:42
Last modified: 03 Oct 2017 16:33

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Contributors

Author: Mohamed A. Afifi
Author: Pedro H.R. Pereira
Author: Ying Chun Wang
Author: Yangwei Wang
Author: Shukui Li

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