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Effect of dynamic plastic deformation on the microstructure and mechanical properties of an Al–Zn–Mg alloy

Effect of dynamic plastic deformation on the microstructure and mechanical properties of an Al–Zn–Mg alloy
Effect of dynamic plastic deformation on the microstructure and mechanical properties of an Al–Zn–Mg alloy
A supersaturated Al–Zn–Mg alloy was processed by dynamic plastic deformation (DPD) using a Split-Hopkinson pressure bar (SHPB) facility with strain range from 0.5 to 1.5 and then subjected to compressive testing at strain rates of 1 × 10−3–4 × 103 s−1. The results show that there is concurrent occurrence of grain refinement, increase in dislocation density and precipitation of fine precipitates in different morphologies during DPD at strain over 1. This enhances the yield strength of the Al alloy after DPD over the as-received material in peak-aging state (T6). Grains are refined through the formation of low angle grain boundaries (LAGBs) by rearrangement of dislocations which leads to the subdivision of original grains. Heterogeneous coarse precipitates mainly of T (Al20Cu2Mn3) and E (Al18Mg3Cr2) phases distribute along dislocations and grain boundaries after DPD. Dynamic precipitation of very fine η′ and η during DPD occurs where the volume fraction of precipitates increases with increasing the number of presses. The influence of precipitates on the strain rate sensitivity is also discussed.
Al–Zn–Mg alloy, Dynamic plastic deformation, Precipitates, Split-Hopkinson pressure bar, Strain rate sensitivity
0921-5093
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Wang, Ying Chun
f248f5c0-cf84-4c8d-8455-00255096e5f3
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Afifi, Mohamed A.
1becb81a-3778-40ea-bb51-162e3535524d
Wang, Ying Chun
f248f5c0-cf84-4c8d-8455-00255096e5f3
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Afifi, Mohamed A., Wang, Ying Chun and Langdon, Terence G. (2020) Effect of dynamic plastic deformation on the microstructure and mechanical properties of an Al–Zn–Mg alloy. Materials Science and Engineering: A, 784, [139287]. (doi:10.1016/j.msea.2020.139287).

Record type: Article

Abstract

A supersaturated Al–Zn–Mg alloy was processed by dynamic plastic deformation (DPD) using a Split-Hopkinson pressure bar (SHPB) facility with strain range from 0.5 to 1.5 and then subjected to compressive testing at strain rates of 1 × 10−3–4 × 103 s−1. The results show that there is concurrent occurrence of grain refinement, increase in dislocation density and precipitation of fine precipitates in different morphologies during DPD at strain over 1. This enhances the yield strength of the Al alloy after DPD over the as-received material in peak-aging state (T6). Grains are refined through the formation of low angle grain boundaries (LAGBs) by rearrangement of dislocations which leads to the subdivision of original grains. Heterogeneous coarse precipitates mainly of T (Al20Cu2Mn3) and E (Al18Mg3Cr2) phases distribute along dislocations and grain boundaries after DPD. Dynamic precipitation of very fine η′ and η during DPD occurs where the volume fraction of precipitates increases with increasing the number of presses. The influence of precipitates on the strain rate sensitivity is also discussed.

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Yingchun-MSEA-22March2020 - Accepted Manuscript
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More information

Accepted/In Press date: 21 March 2020
e-pub ahead of print date: 24 March 2020
Published date: 15 May 2020
Keywords: Al–Zn–Mg alloy, Dynamic plastic deformation, Precipitates, Split-Hopkinson pressure bar, Strain rate sensitivity

Identifiers

Local EPrints ID: 439098
URI: http://eprints.soton.ac.uk/id/eprint/439098
ISSN: 0921-5093
PURE UUID: 2515980d-585f-4d8d-b981-fafccc5fe9ac
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 03 Apr 2020 16:30
Last modified: 26 Nov 2021 05:37

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Contributors

Author: Mohamed A. Afifi
Author: Ying Chun Wang

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