Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy
<b> </b>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...
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doaj-73349bd81dfb4ee1821d0a580f2471ec2020-11-24T22:00:29ZengMDPI AGMetals2075-47012019-11-01911118210.3390/met9111182met9111182Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 AlloyYing Chen0Yuanchen Tang1Houan Zhang2Nan Hu3Nong Gao4Marco J. Starink5Key Laboratory of Functional Materials and Applications of Fujian Province, Xiamen University of Technology, Xiamen 361024, ChinaKey Laboratory of Functional Materials and Applications of Fujian Province, Xiamen University of Technology, Xiamen 361024, ChinaKey Laboratory of Functional Materials and Applications of Fujian Province, Xiamen University of Technology, Xiamen 361024, ChinaEngineering Materials, School of Engineering, University of Southampton, Southampton SO17 1BJ, UKEngineering Materials, School of Engineering, University of Southampton, Southampton SO17 1BJ, UKEngineering Materials, School of Engineering, University of Southampton, Southampton SO17 1BJ, UK<b> </b>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<sup>−3</sup>, 61.9 ± 1.4 nm, and (2.58 ± 0.07) × 10<sup>14</sup> m<sup>−2</sup>, 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.https://www.mdpi.com/2075-4701/9/11/1182high-pressure torsional-cu-mg alloysolute segregation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ying Chen Yuanchen Tang Houan Zhang Nan Hu Nong Gao Marco J. Starink |
spellingShingle |
Ying Chen Yuanchen Tang Houan Zhang Nan Hu Nong Gao Marco J. Starink Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy Metals high-pressure torsion al-cu-mg alloy solute segregation |
author_facet |
Ying Chen Yuanchen Tang Houan Zhang Nan Hu Nong Gao Marco J. Starink |
author_sort |
Ying Chen |
title |
Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy |
title_short |
Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy |
title_full |
Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy |
title_fullStr |
Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy |
title_full_unstemmed |
Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy |
title_sort |
microstructures and hardness prediction of an ultrafine-grained al-2024 alloy |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2019-11-01 |
description |
<b> </b>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<sup>−3</sup>, 61.9 ± 1.4 nm, and (2.58 ± 0.07) × 10<sup>14</sup> m<sup>−2</sup>, 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. |
topic |
high-pressure torsion al-cu-mg alloy solute segregation |
url |
https://www.mdpi.com/2075-4701/9/11/1182 |
work_keys_str_mv |
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