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- Title
Toward strength-ductility synergy in Al–Mg alloys: augmenting solute Mg concentration and strain-hardening ability via melt spinning and hot extrusion.
- Authors
Zhang, Xinkui; Li, Liejun; Deng, Chiyu; Peng, Zhengwu
- Abstract
Al–Mg alloys offer a compelling combination of high tensile strength and low density, yet conventional high-Mg alloying often yields dense Al3Mg2 precipitates that compromise processability and ductility. To address this challenge, this work combined melt spinning and hot extrusion to achieve a supersaturated matrix and fine-grain structure in Al–Mg alloys with high-Mg content. The produced Al–9 Mg alloy exhibited exceptional tensile strength (~ 388 MPa) and elongation (~ 31%), surpassing Al–6 Mg and Al–12 Mg alloys. It is revealed that the high-Mg solute concentration contributes significantly to solid solution strengthening, reduces stacking fault energy to facilitate recrystallization and grain refinement, and, most crucially, augments strain-hardening ability. This augmentation delays localized deformation, alleviates stress concentration and enhances strength and ductility concurrently. The novel process holds the potential to overcome challenges associated with conventional alloying and paves the way for developing high-performance alloys with exceptional strength-ductility synergy.
- Subjects
MELT spinning; SOLUTION strengthening; STRESS concentration; GRAIN refinement; TENSILE strength
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 23, p10541
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09803-1