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Development of a high-strength Al-Zn-Mg-Cu-based alloy via multi-strengthening mechanisms
- Issue Date
- 12월-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- 7xxx Series aluminum alloy; Mechanical properties; Microalloying; Symmetry quantification
- Citation
- SCRIPTA MATERIALIA, v.205
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 205
- ISSN
- 1359-6462
- Abstract
- We develop high-strength of Al-Zn-Mg-Cu-based alloys (7xxx series) by optimizing the amount of Mg/Cu with a trace addition of Sc. The highest mechanical properties are achieved with sigma(UTS)=672 MPa (sigma(y) = 644 MPa) and epsilon = 8.6%. Based on quantitative symmetry measurements, the improved mechanical strength originates from nanoscopic structural distortion caused by the excessive solutes of Mg and Cu as the amount of Mg/Cu increases. In addition, Sc microalloying induces grain refinement, thus enhancing the mechanical properties. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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