Solute micro-segregation profile and associated precipitation in cast Al-Mg-Si alloy

Artenis Bendo*, Jonathan Fellowes, Matthew Smith, Masoud Moshtaghi, Zelong Jin, Kenji Matsuda, Zhongyun Fan, Xiaorong Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The micro-segregation in the as-cast AA6082 aluminium alloy were investigated across a range of length scales using a combination of analytical electron microscopes. It is found that the micro-segregation bands form an inter-connected network following grain boundaries and inter-dendritic channels. The micro-segregation can be divided into major micro-segregation and minor micro-segregation; the former is mainly on the grain boundaries consisting of iron-bearing intermetallic; the latter occurs both, along the grain boundaries and inter-dendritic channels, consisting mainly of Mg and Si alloying elements. The atomic-scale imaging reveals that in the minor-segregation bands, the supersaturated solute concertation has formed precipitates that had either nucleated heterogeneously on the dislocation network or homogeneously inside the aluminium matrix. The heterogeneously nucleated precipitates in the dislocation lines are composed of a mixture of phases down the precipitation sequence meanwhile, the homogenously grown ones are discrete phases that appear at the early stages of the precipitation sequence.

Original languageEnglish
Pages (from-to)801-827
Number of pages27
JournalPhilosophical Magazine
Volume104
Issue number19-20
DOIs
StatePublished - 2024

Keywords

  • aluminium alloy
  • casting
  • intermetallic phases
  • precipitation
  • segregation
  • transmission electron microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

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