Effect of silver addition on the β′-phase in Al-Mg-Si-Ag alloy

J. Nakamura, K. Matsuda, T. Kawabata, T. Sato, Y. Nakamura, S. Ikeno

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The metastable β′-phase that forms in an alloy with composition Al-1.0mass% Mg2Si-0.5 mass% Ag, over aged at 523 K, has been investigated by transmission electron microscopy (TEM) in order to understand the effect of Ag-addition on the crystal structure of this phase. According to the results of analyses of selected area diffraction pattern, high resolution TEM (HRTEM), energy dispersive X-ray spectroscopy (EDS), the elemental maps by energy-filtered TEM (EFTEM) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), this precipitate consists of Mg, Si and Ag, and has a hexagonal unit cell which is similar to that of β′ phase in Al-Mg-Si alloys without Ag. However, the unit cell α-axis of β′ with Ag was 0.69 nm, which is slightly smaller than the corresponding dimension in Ag-free β′ (0.71 nm). The bond overlap population (BOP) was also calculated for the bonding between atoms in the small cluster in the β′-phase by the discrete-variational (DV)-Xa method, suggesting the bonding in β′ with Ag was higher than in the Ag-free β′.

Original languageEnglish
Pages (from-to)310-316
Number of pages7
JournalMaterials Transactions
Volume51
Issue number2
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • Aluminum alloys
  • Precipitation
  • Silver-addition
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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