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Investigation on the Strain Distribution in Tube High-Pressure Shearing
Open AccessArticle

Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy

1
Key Laboratory of Functional Materials and Applications of Fujian Province, Xiamen University of Technology, Xiamen 361024, China
2
Engineering Materials, School of Engineering, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1182; https://doi.org/10.3390/met9111182
Received: 16 October 2019 / Revised: 29 October 2019 / Accepted: 29 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Advances in Ultrafine-Grained Metals Research)
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. View Full-Text
Keywords: high-pressure torsion; Al-Cu-Mg alloy; solute segregation high-pressure torsion; Al-Cu-Mg alloy; solute segregation
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Chen, Y.; Tang, Y.; Zhang, H.; Hu, N.; Gao, N.; Starink, M.J. Microstructures and Hardness Prediction of an Ultrafine-Grained Al-2024 Alloy. Metals 2019, 9, 1182.

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