Effects of Sc and Be Microalloying Elements on Mechanical Properties of Al-Zn-Mg-Cu (Al7xxx) Alloy

Sung Jae Won, Hyeongsub So, Jung Woo Han, Soong Ju Oh, Leeseung Kang, Kyou Hyun Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We demonstrate via comprehensive microstructural investigation the effects of Sc and Be microalloying on the mechanical properties of Al-Zn-Mg-Cu-based alloys, where Sc microalloying enhances the tensile properties of an Al-9.0Zn-3.0Mg-3.0Cu alloy from 645 MPa (εf = ~6%) to 672 MPa (εf = ~8%). In contrast, simultaneous microalloying with Sc and Be reduces the mechanical strength of a synthesized Al alloy to 654 MPa (εf = ~8%). Comprehensive microstructural investigation revealed that Sc microalloying leads to Al grain refinement, the formation of hardening (MgZn2, Al3M) phases, and an increase in the solid solution of Al. Additional Be microalloying also enhances the formation of MgZn2 phase, while Al3M (M: Zr, Sc) type phases are restrained from forming in Al grains. Furthermore, solid solution in Al grains is reduced by the trace addition of Be microalloying, resulting in an increase in large intermetallic compounds at Al grain boundaries.

Original languageEnglish
Article number340
Issue number2
Publication statusPublished - 2023 Feb

Bibliographical note

Funding Information:
This research was financially supported by the Institute of Civil Military Technology Cooperation, funded by the Defense Acquisition Program Administration and the Ministry of Trade, Industry and Energy of the Korean Government, under grant No. UM21308RD3. This study was also partially supported by the R&D program and research facilities of the Korea Institute of Industrial Technology.

Publisher Copyright:
© 2023 by the authors.


  • 7xxx series aluminum alloy
  • mechanical properties
  • microalloying

ASJC Scopus subject areas

  • General Materials Science
  • Metals and Alloys


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