Effects of trace amounts of Zr and Sc on the recrystallization behavior and mechanical properties of Al-4.5Zn-1.6Mg alloys

Yu Chih Tzeng, Chen Yuan Chung, Hui Ching Chien

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17 Scopus citations

Abstract

The effects of Zr and Sc on the recrystallization behavior and mechanical properties in Al-4.5Zn-1.6Mg alloy were investigated to understand the strengthening mechanism and to improve the mechanical properties. The results show that the Al-4.5Zn-1.6Mg alloys without the Zr and Sc addition obtained a coarse grain structure; the addition of 0.1% Zr to the Al-4.5Zn-1.6Mg alloy, made it possible to inhibit the grain growth; the addition of 0.1% Sc led to better inhibition to recrystallization through fine precipitates of coherent Al3Sc phases. The precipitation of coherent Al3Sc particles acted to strongly pin the grain boundaries, thereby effectively restraining their migration leading to the higher strength of the Sc-containing Al-4.5Zn-1.6Mg alloy.

Original languageEnglish
Pages (from-to)270-272
Number of pages3
JournalMaterials Letters
Volume228
DOIs
StatePublished - 1 Oct 2018

Keywords

  • Al-4.5Zn-1.6Mg alloy
  • Microstructure
  • Recrystallization
  • Sc
  • Zr

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