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Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing

Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing
Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing
Experiments were conducted to examine the influence of equal-channel angular pressing (ECAP) and post-ECAP annealing on the microstructures of an Al-Zn-Mg alloy. The results that precipitates, mainly of the η', η (MgZn2), T (Al20Cu2Mn3) and E (Al18Mg3Cr2) phases, are fragmented to fine spherical precipitates during ECAP processing for 4 and 8 passes. After post-ECAP annealing at 393 and 473 K for 20 h, precipitates with larger sizes lie primarily along the grain boundaries and finer particles are evenly distributed within the grains. Increasing the numbers of ECAP passes from 4 to 8 leads to an increase in the volume fraction of the finer precipitates in the ECAP-processed and annealed alloy. After 4 passes and heat treatment at 473 K, the precipitates are slightly larger compared with the alloy processed under identical conditions and annealed at 393 K. Nevertheless, significant coarsening is evident after
processing for 8 passes and increasing the annealing temperature from 393 to 473 K. Different types of precipitates are effective in impeding grain growth during the post-ECAP annealing even at 473 K for 20 h. In addition, η precipitates form within the T and E phases after both ECAP and post-ECAP annealing.
0921-5093
146-156
Afifi, Mohamed A.
5895f62e-25cf-4f5f-89ea-27252964f633
Wang, Ying C.
d716cd24-e343-4caf-a9f0-230443f0f5ae
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Yangwei
0e44033c-c31a-4ab6-8603-49a62133d45d
Li, Shukui
1bd8fb0f-46a0-42f8-9fba-cd2c4d594422
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Afifi, Mohamed A.
5895f62e-25cf-4f5f-89ea-27252964f633
Wang, Ying C.
d716cd24-e343-4caf-a9f0-230443f0f5ae
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Wang, Yangwei
0e44033c-c31a-4ab6-8603-49a62133d45d
Li, Shukui
1bd8fb0f-46a0-42f8-9fba-cd2c4d594422
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Afifi, Mohamed A., Wang, Ying C., Pereira, Pedro Henrique R., Wang, Yangwei, Li, Shukui, Huang, Yi and Langdon, Terence G. (2018) Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing Materials Science and Engineering: A, 712, pp. 146-156. (doi:10.1016/j.msea.2017.11.091).

Record type: Article

Abstract

Experiments were conducted to examine the influence of equal-channel angular pressing (ECAP) and post-ECAP annealing on the microstructures of an Al-Zn-Mg alloy. The results that precipitates, mainly of the η', η (MgZn2), T (Al20Cu2Mn3) and E (Al18Mg3Cr2) phases, are fragmented to fine spherical precipitates during ECAP processing for 4 and 8 passes. After post-ECAP annealing at 393 and 473 K for 20 h, precipitates with larger sizes lie primarily along the grain boundaries and finer particles are evenly distributed within the grains. Increasing the numbers of ECAP passes from 4 to 8 leads to an increase in the volume fraction of the finer precipitates in the ECAP-processed and annealed alloy. After 4 passes and heat treatment at 473 K, the precipitates are slightly larger compared with the alloy processed under identical conditions and annealed at 393 K. Nevertheless, significant coarsening is evident after
processing for 8 passes and increasing the annealing temperature from 393 to 473 K. Different types of precipitates are effective in impeding grain growth during the post-ECAP annealing even at 473 K for 20 h. In addition, η precipitates form within the T and E phases after both ECAP and post-ECAP annealing.

Text WangYC-MSE accepted manuscript_2017-11 - Accepted Manuscript
Restricted to Repository staff only until 26 November 2018.
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Accepted/In Press date: 22 November 2017
e-pub ahead of print date: 26 November 2017
Published date: 17 January 2018

Identifiers

Local EPrints ID: 415966
URI: http://eprints.soton.ac.uk/id/eprint/415966
ISSN: 0921-5093
PURE UUID: 6249788d-d291-4de5-91e7-c4fc9ea31a20
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 29 Nov 2017 17:30
Last modified: 17 Jan 2018 17:30

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Contributors

Author: Mohamed A. Afifi
Author: Ying C. Wang
Author: Pedro Henrique R. Pereira
Author: Yangwei Wang
Author: Shukui Li
Author: Yi Huang ORCID iD

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