Microstructure and mechanical properties of a 5754 aluminum alloy modified by Sc and Zr additions

Christian B. Fuller*, Albert R. Krause, David C Dunand, David N Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

99 Scopus citations

Abstract

The effects of various heat treatments upon the microstructure and mechanical properties of a rolled 5754 aluminum alloy modified with 0.23 wt.% Sc and 0.22 wt.% Zr were investigated. Grain size, as well as precipitate size, type, and morphology were observed by optical and transmission electron microscopies. Two populations of the Al3Sc1-xZrx phase were present: (i) large incoherent precipitates formed during solidification and hot-rolling; and (ii) fine coherent precipitates formed from secondary precipitation, which improved alloy strength, as shown by hardness, tensile, and fatigue measurements. Aging, however, also produced two types of grain-boundary precipitates, Al6Mn and β-Al3Mg2, which contributed to poorer fatigue behavior and reduced ductility.

Original languageEnglish (US)
Pages (from-to)8-16
Number of pages9
JournalMaterials Science and Engineering A
Volume338
Issue number1-2
DOIs
StatePublished - Dec 15 2002

Keywords

  • Al-Sc-Zr alloys
  • Aluminum alloys
  • Fatigue (materials)
  • Mechanical properties
  • Microstructural properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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