Microstructures and hardness prediction of an ultrafine-grained Al-2024 alloy
Microstructures and hardness prediction of an ultrafine-grained Al-2024 alloy
High-pressure torsion (HPT) is a high efficiency processing method for fabricating bulk ultrafine-grained metallic materials. This work investigates microstructures and evaluates the corresponding strengthening components in the center of HPT disks, where effective shear strains are very low. An Al-4.63Cu-1.51Mg (wt. %) alloy was processed by HPT for 5 rotations. Non-equilibrium grain and sub-grain boundaries were observed using scanning transmission electron microscopy in the center area of HPT disks. Solute co-cluster segregation at grain boundaries was found by energy dispersive spectrometry. Quantitative analysis of X-ray diffraction patterns showed that the average microstrain, crystalline size, and dislocation density were (1.32 ± 0.07) × 10−3, 61.9 ± 1.4 nm, and (2.58 ± 0.07) × 1014 m−2, respectively. The ultra-high average hardness increment was predicted on multiple mechanisms due to ultra-high dislocation densities, grain refinement, and co-cluster–defect complexes.
high-pressure torsion, Al-Cu-Mg alloy, solute segregation
Chen, Ying
8658c64a-54df-4113-b8af-9bf850dbde46
Tang, Yuanchen
35ad1686-d42c-41fb-88de-ed383a91a92b
Zhang, Houan
149e305a-7662-414c-a6bb-f740d295c91a
Hu, Nan
2b47674d-c466-4ccf-8b34-76c429e648ab
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
November 2019
Chen, Ying
8658c64a-54df-4113-b8af-9bf850dbde46
Tang, Yuanchen
35ad1686-d42c-41fb-88de-ed383a91a92b
Zhang, Houan
149e305a-7662-414c-a6bb-f740d295c91a
Hu, Nan
2b47674d-c466-4ccf-8b34-76c429e648ab
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Chen, Ying, Tang, Yuanchen, Zhang, Houan, Hu, Nan, Gao, Nong and Starink, Marco J.
(2019)
Microstructures and hardness prediction of an ultrafine-grained Al-2024 alloy.
Metals, 9 (11), [1182].
(doi:10.3390/met9111182).
Abstract
High-pressure torsion (HPT) is a high efficiency processing method for fabricating bulk ultrafine-grained metallic materials. This work investigates microstructures and evaluates the corresponding strengthening components in the center of HPT disks, where effective shear strains are very low. An Al-4.63Cu-1.51Mg (wt. %) alloy was processed by HPT for 5 rotations. Non-equilibrium grain and sub-grain boundaries were observed using scanning transmission electron microscopy in the center area of HPT disks. Solute co-cluster segregation at grain boundaries was found by energy dispersive spectrometry. Quantitative analysis of X-ray diffraction patterns showed that the average microstrain, crystalline size, and dislocation density were (1.32 ± 0.07) × 10−3, 61.9 ± 1.4 nm, and (2.58 ± 0.07) × 1014 m−2, respectively. The ultra-high average hardness increment was predicted on multiple mechanisms due to ultra-high dislocation densities, grain refinement, and co-cluster–defect complexes.
Text
metals-09-01182-v3
- Version of Record
More information
Accepted/In Press date: 29 October 2019
e-pub ahead of print date: 1 November 2019
Published date: November 2019
Keywords:
high-pressure torsion, Al-Cu-Mg alloy, solute segregation
Identifiers
Local EPrints ID: 436938
URI: http://eprints.soton.ac.uk/id/eprint/436938
ISSN: 2075-4701
PURE UUID: 840097c3-c0f4-47cb-8432-f1afddc3c77a
Catalogue record
Date deposited: 14 Jan 2020 17:31
Last modified: 17 Mar 2024 02:53
Export record
Altmetrics
Contributors
Author:
Ying Chen
Author:
Yuanchen Tang
Author:
Houan Zhang
Author:
Nan Hu
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
