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

研究成果: Article査読

21 被引用数 (Scopus)


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′.

ジャーナルMaterials Transactions
出版ステータスPublished - 2010 2

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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