The effects of multi-stage homogenizations on the microstructures and mechanical properties of al–zn–mg –zr–sc alloys

Yang Chun Chiu, Tse An Pan, Mien Chung Chen, Jun Wei Zhang, Hui Yun Bor, Sheng Long Lee

Research output: Contribution to journalArticlepeer-review

Abstract

This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al– 4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystal-lized Al–4.5Zn–1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al3 Zr/Al3 Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al–4.5Zn–1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. There-fore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%).

Original languageEnglish
Article number470
Pages (from-to)1-15
Number of pages15
JournalApplied Sciences (Switzerland)
Volume11
Issue number2
DOIs
StatePublished - 2 Jan 2021

Keywords

  • Al–Zn–Mg alloy
  • Multi-stage homogenizations
  • Recrystallized microstructures
  • Scandium
  • Zirconium

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