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Flow behaviour and microstructural stability in an Al-3Mg-0.2Sc alloy processed by high-pressure torsion at different temperatures

Flow behaviour and microstructural stability in an Al-3Mg-0.2Sc alloy processed by high-pressure torsion at different temperatures
Flow behaviour and microstructural stability in an Al-3Mg-0.2Sc alloy processed by high-pressure torsion at different temperatures
Experiments were performed to examine the flow behaviour at room temperature (RT ≈ 300 K) and the microstructural stability of a solution-treated Al-3Mg-0.2Sc alloy processed through 10 turns of high-pressure torsion (HPT) at either RT or 450 K and further annealed for 1 h at temperatures (T) up to 773 K. The results revealed that the Al-3Mg-0.2Sc alloy achieved yield strengths of ~590 and 540 MPa after HPT at RT and 450 K, respectively. This followed from the higher dislocation densities achieved after processing at RT since both microstructures had average grain diameters of ~320 nm. After annealing at T ≥ 523 K, there was evidence for the onset of dynamic strain ageing (DSA) during tensile testing at RT and this occurred concurrently with increases in the elongations to failure. The grain structures developed during HPT at 450 K exhibited superior microstructural stability than after HPT at RT for comparable heating conditions.
A model derived for materials having second-phase particles was applied to understand the microstructural evolution observed during heating. It is shown that the values calculated for the driving and restraining pressures for boundary migration and the boundary stability factors are consistent with the experimental results.
aluminium alloys, flow properties, grain refinement, high-pressure torsion, microstructural stability, portevin-le chatelier effect, Flow properties, Aluminium alloys, High-pressure torsion, Portevin-le chatelier effect, Grain refinement, Microstructural stability
0921-5093
Rodrigues Pereira, Pedro Henrique
9ee129fd-0e06-482d-990c-971aaf83b1d0
Bazarnik, Piotr
7612d50d-0cfc-43b1-a48f-f5062caacc1e
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Rodrigues Pereira, Pedro Henrique
9ee129fd-0e06-482d-990c-971aaf83b1d0
Bazarnik, Piotr
7612d50d-0cfc-43b1-a48f-f5062caacc1e
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Rodrigues Pereira, Pedro Henrique, Bazarnik, Piotr, Huang, Yi, Lewandowska, Malgorzata and Langdon, Terence G. (2023) Flow behaviour and microstructural stability in an Al-3Mg-0.2Sc alloy processed by high-pressure torsion at different temperatures. Materials Science And Engineering A, 887, [145766]. (doi:10.1016/j.msea.2023.145766).

Record type: Article

Abstract

Experiments were performed to examine the flow behaviour at room temperature (RT ≈ 300 K) and the microstructural stability of a solution-treated Al-3Mg-0.2Sc alloy processed through 10 turns of high-pressure torsion (HPT) at either RT or 450 K and further annealed for 1 h at temperatures (T) up to 773 K. The results revealed that the Al-3Mg-0.2Sc alloy achieved yield strengths of ~590 and 540 MPa after HPT at RT and 450 K, respectively. This followed from the higher dislocation densities achieved after processing at RT since both microstructures had average grain diameters of ~320 nm. After annealing at T ≥ 523 K, there was evidence for the onset of dynamic strain ageing (DSA) during tensile testing at RT and this occurred concurrently with increases in the elongations to failure. The grain structures developed during HPT at 450 K exhibited superior microstructural stability than after HPT at RT for comparable heating conditions.
A model derived for materials having second-phase particles was applied to understand the microstructural evolution observed during heating. It is shown that the values calculated for the driving and restraining pressures for boundary migration and the boundary stability factors are consistent with the experimental results.

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Accepted/In Press date: 28 September 2023
e-pub ahead of print date: 29 September 2023
Published date: 5 October 2023
Additional Information: Funding Information: This research was supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL and YH), FAPEMIG under Grant APQ-01342–21 (PHRP) and CNPq under Grant No . 443736/2018–9 (PHRP).
Keywords: aluminium alloys, flow properties, grain refinement, high-pressure torsion, microstructural stability, portevin-le chatelier effect, Flow properties, Aluminium alloys, High-pressure torsion, Portevin-le chatelier effect, Grain refinement, Microstructural stability

Identifiers

Local EPrints ID: 484735
URI: http://eprints.soton.ac.uk/id/eprint/484735
ISSN: 0921-5093
PURE UUID: 915836c4-53b3-4579-9b31-b5ff26a1118d
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

Catalogue record

Date deposited: 20 Nov 2023 17:54
Last modified: 06 Jun 2024 04:07

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Contributors

Author: Pedro Henrique Rodrigues Pereira
Author: Piotr Bazarnik
Author: Yi Huang ORCID iD
Author: Malgorzata Lewandowska

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