Development of a high-strength Al-Zn-Mg-Cu-based alloy via multi-strengthening mechanisms

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

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


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 σUTS=672 MPa (σy=644 MPa) and ε=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.

Original languageEnglish
Article number114216
JournalScripta Materialia
Publication statusPublished - 2021 Dec

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. UM18206RD2. This study was also partially supported by the R&D program and research facilities of the Korea Institute of Industrial Technology.

Publisher Copyright:
© 2021


  • 7xxx Series aluminum alloy
  • Mechanical properties
  • Microalloying
  • Symmetry quantification

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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