Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system
Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system
The mechanical properties and structural stability of a high-pressure torsion (HPT)-induced bulk nanostructured metastable Al–Mg system were examined after natural aging at room temperature for 60 days. The sample demonstrated a high yield strength of 1.3–1.5 GPa with an excellent plasticity by achieving a high strain rate sensitivity of 0.036. The high hardness is attributed to the concurrent contributions of grain refinement and solid solution strengthening. An X-ray diffraction analysis revealed a high compositional microstrain of ~0.0202 due to the supersaturation of Mg in the Al matrix after processing. This microstrain increased to ~0.0274 after natural aging due to the heterogeneous distribution of supersaturated Mg solutes without any nucleation of a second phase, thereby demonstrating a reasonable structural stability.
Grain refinement, High-pressure torsion, Metastable phase, Plasticity, X-ray diffraction
Han, Jae-Kyung
dfb10a54-9cc7-4a9c-8aa7-6b68a8f288a3
Liss, Klaus-Dieter
436269cc-551c-4ef2-bed6-1a8b78a94545
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Jang, Jae-il
ff5d7633-5898-48b3-b45b-1e446552accb
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
7 October 2020
Han, Jae-Kyung
dfb10a54-9cc7-4a9c-8aa7-6b68a8f288a3
Liss, Klaus-Dieter
436269cc-551c-4ef2-bed6-1a8b78a94545
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Jang, Jae-il
ff5d7633-5898-48b3-b45b-1e446552accb
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Han, Jae-Kyung, Liss, Klaus-Dieter, Langdon, Terence G, Jang, Jae-il and Kawasaki, Megumi
(2020)
Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system.
Materials Science and Engineering: A, 796, [140050].
(doi:10.1016/j.msea.2020.140050).
Abstract
The mechanical properties and structural stability of a high-pressure torsion (HPT)-induced bulk nanostructured metastable Al–Mg system were examined after natural aging at room temperature for 60 days. The sample demonstrated a high yield strength of 1.3–1.5 GPa with an excellent plasticity by achieving a high strain rate sensitivity of 0.036. The high hardness is attributed to the concurrent contributions of grain refinement and solid solution strengthening. An X-ray diffraction analysis revealed a high compositional microstrain of ~0.0202 due to the supersaturation of Mg in the Al matrix after processing. This microstrain increased to ~0.0274 after natural aging due to the heterogeneous distribution of supersaturated Mg solutes without any nucleation of a second phase, thereby demonstrating a reasonable structural stability.
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Accepted/In Press date: 2 August 2020
e-pub ahead of print date: 6 August 2020
Published date: 7 October 2020
Keywords:
Grain refinement, High-pressure torsion, Metastable phase, Plasticity, X-ray diffraction
Identifiers
Local EPrints ID: 443636
URI: http://eprints.soton.ac.uk/id/eprint/443636
ISSN: 0921-5093
PURE UUID: 2b09aa22-14c5-4e33-8014-ad15d3521a4a
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Date deposited: 07 Sep 2020 16:30
Last modified: 06 Jun 2024 04:19
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Author:
Jae-Kyung Han
Author:
Klaus-Dieter Liss
Author:
Jae-il Jang
Author:
Megumi Kawasaki
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