Effects of Minor Sc and Zr on the Microstructure and Mechanical Properties of Al-4.6Cu-0.3Mg-0.6Ag Alloys

Sheng Long Lee, Chih Ting Wu, Yu De Chen

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Effects of minor Sc and Zr on the microstructure and mechanical properties of Al-4.6Cu-0.3Mg-0.6Ag alloys were investigated. The results indicate that Sc- and Zr-containing alloy as well as Sc-containing alloy could produce grain refinement effects. Both the alloys had lower tensile strength and hardness compared to Sc- and Zr-free alloy, mainly because solution heat treatment could not dissolve W (Al8.5-4Cu6.6-4Sc) phase, lowering the Cu concentration in the Al matrix. Insufficient Cu solute atoms in the Al matrix could not produce a large amount of Ω and θ′ strengthening precipitates to enhance the tensile strength and hardness following T7 heat treatment. However, the T7-treated Sc-containing alloy and the T7-treated Sc- and Zr-containing alloy have similar mechanical properties. Zirconium can partially replace expensive Sc to produce grain refinement effects on Al-Cu-Mg-Ag alloys.

Original languageEnglish
Pages (from-to)1165-1172
Number of pages8
JournalJournal of Materials Engineering and Performance
Volume24
Issue number3
DOIs
StatePublished - Mar 2015

Keywords

  • Al-Cu-Mg-Ag alloy
  • Sc
  • W phase
  • Zr

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