The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

An evaluation of the microstructure and microhardness in an Al–Zn–Mg alloy processed by ECAP and post‐ECAP heat treatments

An evaluation of the microstructure and microhardness in an Al–Zn–Mg alloy processed by ECAP and post‐ECAP heat treatments
An evaluation of the microstructure and microhardness in an Al–Zn–Mg alloy processed by ECAP and post‐ECAP heat treatments
Herein the microstructure evolution and microhardness variations in a peak‐aged Al–Zn–Mg alloy after equal‐channel angular pressing (ECAP) for 1–8 passes followed by heat treatments at temperatures of 393–473 K for 5–20 h are examined. The results show that ECAP processing hardens the alloy, and the hardness increases with each pass due to grain refinement, the formation of large numbers of fine precipitates, and the introduction of a high dislocation density. Post‐ECAP annealing at 393 K up to 20 h after 1 and 4 passes of ECAP leads to a further increase in microhardness and this increase is substantial for an annealing time of 20 h after 1 pass due primarily to the extensive formation of a nano‐sized η′ phase. After ECAP for 8 passes, post‐ECAP annealing at 393 K for 5 h or more leads to softening due to the occurrence of recrystallization and the transformation of fine η′ to coarse η. Post‐ECAP anneals at the higher temperatures of 423 and 473 K are not capable of producing high hardness values.
Al-Zn-Mg alloy, equal-channel angular pressing (ECAP), microhardness, post-ECAP heat treatment, precipitates
1438-1656
1-8
Wang, Ying Chun
a2be0060-0a68-4eea-8423-f29c74395b64
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Cheng, Xingwang
a6620e1f-2f98-42b8-a683-29b5bd2920d1
Li, Shukui
19c3a610-ebf7-43e3-b13a-2cf61a219d0b
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wang, Ying Chun
a2be0060-0a68-4eea-8423-f29c74395b64
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Cheng, Xingwang
a6620e1f-2f98-42b8-a683-29b5bd2920d1
Li, Shukui
19c3a610-ebf7-43e3-b13a-2cf61a219d0b
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Wang, Ying Chun, Afifi, Mohamed A., Cheng, Xingwang, Li, Shukui and Langdon, Terence G. (2020) An evaluation of the microstructure and microhardness in an Al–Zn–Mg alloy processed by ECAP and post‐ECAP heat treatments. Advanced Engineering Materials, 22 (1), 1-8, [1901040]. (doi:10.1002/adem.201901040).

Record type: Article

Abstract

Herein the microstructure evolution and microhardness variations in a peak‐aged Al–Zn–Mg alloy after equal‐channel angular pressing (ECAP) for 1–8 passes followed by heat treatments at temperatures of 393–473 K for 5–20 h are examined. The results show that ECAP processing hardens the alloy, and the hardness increases with each pass due to grain refinement, the formation of large numbers of fine precipitates, and the introduction of a high dislocation density. Post‐ECAP annealing at 393 K up to 20 h after 1 and 4 passes of ECAP leads to a further increase in microhardness and this increase is substantial for an annealing time of 20 h after 1 pass due primarily to the extensive formation of a nano‐sized η′ phase. After ECAP for 8 passes, post‐ECAP annealing at 393 K for 5 h or more leads to softening due to the occurrence of recrystallization and the transformation of fine η′ to coarse η. Post‐ECAP anneals at the higher temperatures of 423 and 473 K are not capable of producing high hardness values.

Text
Yingchun-AEM-Text 2019 - Accepted Manuscript
Download (56kB)
Text
Yingchun-AEM-Figures 2019 - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 25 October 2019
e-pub ahead of print date: 8 November 2019
Published date: January 2020
Additional Information: Special Issue: Dedicated to Terence G. Langdon on the occasion of his 80th birthday
Keywords: Al-Zn-Mg alloy, equal-channel angular pressing (ECAP), microhardness, post-ECAP heat treatment, precipitates

Identifiers

Local EPrints ID: 437289
URI: http://eprints.soton.ac.uk/id/eprint/437289
ISSN: 1438-1656
PURE UUID: 08c16449-3f29-41b8-afa1-0e0d6d7b33da
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 23 Jan 2020 17:34
Last modified: 26 Nov 2021 05:35

Export record

Altmetrics

Contributors

Author: Ying Chun Wang
Author: Mohamed A. Afifi
Author: Xingwang Cheng
Author: Shukui Li

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×