Cu segregation around metastable phase in Al-Mg-Si alloy with Cu

Kenji Matsuda*, Daisuke Teguri, Tatsuo Sato, Yasuhiro Uetani, Susumu Ikeno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Cu distribution around Q′-phase in an Al-1.0 mass% Mg 2Si-0.5 mass% Cu alloy has been investigated by the analytical transmission electron microscope (TEM), energy-filtering TEM (EFTEM), and high angular annular dark field scanning TEM (HAADF-STEM) techniques in order to determine the effect of Cu on the precipitation of this alloy. Cu- segregation around rod-shaped precipitates in the sample aged at 523 K for 24 ks was confirmed by energy dispersive X-ray spectroscopy, elemental maps, and HAADF-STEM images. Cu-segregation was also detected from small precipitates, which show a hexagonal network with a lattice constant of 1.04 nm in their HRTEM images. Coarse rods show homogeneous distribution of Cu, and chemical composition is similar to that of coarse Q′- or Q-phase. Small precipitates less than 10 nm were also confirmed in as-quenched samples, and those precipitates seem to form during quenching.

Original languageEnglish
Pages (from-to)967-974
Number of pages8
JournalMaterials Transactions
Volume48
Issue number5
DOIs
StatePublished - 2007/05

Keywords

  • Aluminum-magnesium-silicon alloy
  • Copper addition
  • Energy-filtering transmission electron microscopy
  • Metastable phase

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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