Effect of Cu or Ag addition on precipitation sequence in Al-Mg 2Si alloys containing Mg in excess

Junya Nakamura, Kenji Matsuda, Azusa Furihata, Kenji Niwa, Tokimasa Kawabata, Susumu Ikeno

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The precipitates in Cu or Ag added excess Mg type Al-Mg-Si (ex.Mg) alloys at over aged condition have been observed by high resolution transmission electron microscope (HRTEM), classified according to characteristic of their HRTEM images, and compared with those in the ex.Mg alloy to understand the effect of Cu and Ag addition on their precipitation sequence. HRTEM images obtained for cross sections of precipitates in the Ag added ex.Mg (ex.Mg-Ag) alloy have been classified into five types according to the periodicity of bright dots in them; the random-type, parallelogram-type precipitates, parallelogram-type (60°) precipitate having interior angle about 60°, β″ and β′-phases. The β′-phase in this alloy was predominant in later stage of aging. HRTEM images obtained for cross sections of precipitates in the Cu added ex.Mg (ex.Mg-Cu) alloy have been also classified into the same five types of precipitates as those in ex.Mg-Ag alloy. In addition, the Q′ phase has been also observed in this alloy and it was predominant in later stage of aging. Different shape of precipitate has been also confirmed in both alloys. It is the lath shaped precipitate having elongated cross section, and it has been regarded as the elongated type precipitate. This elongated type precipitate in ex.Mg-Cu alloy was predominant in later stage of aging, although there were a few in ex.Mg-Ag alloy.

本文言語English
ページ(範囲)164-169
ページ数6
ジャーナルKeikinzoku/Journal of Japan Institute of Light Metals
60
4
DOI
出版ステータスPublished - 2010 4

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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