3DAP characterization and thermal stability of nano-scale clusters in Al-Mg-Si alloys

Ai Serizawa, Shoichi Hirosawa, Tatsuo Sato

研究成果: Conference contribution

41 被引用数 (Scopus)

抄録

The formation of nano-scale clusters (nanoclusters) prior to the precipitation of the strengthening β" phase significantly influences the two-step aging behavior of Al-Mg-Si alloys. In this work, two types of nanoclusters are found to be formed at different temperatures. The characterization of these two nanoclusters has been performed from the viewpoints of composition and thermal stability using a three-dimensional atom probe (3DAP) and differential scanning calorimetry (DSC). Mg-Si co-clusters formed at room temperature (RT), Cluster(1), play a deleterious role in the subsequent formation of the β" phase because of the high thermal stability even at the bake-hardening (BH) temperature of 443K. In contrast, the nanoclusters formed by pre-aging at 373K, Cluster(2), are effective in the formation of the refined β", suggesting that Cluster(2) transforms more easily into the β" phase than Cluster(1). The quantitative estimation of the chemical compositions of the two nanoclusters suggests that the Mg/Si ratio is one of the key factors in addition to the internal structures consisting of Si, Mg and probably vacancies. The detailed two-step aging mechanism in Al-Mg-Si alloys is proposed based on the characteristics of the two types of nanoclusters.

本文言語English
ホスト出版物のタイトルAluminium Alloys 2006
ホスト出版物のサブタイトルResearch Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys
ページ245-250
ページ数6
PART 1
出版ステータスPublished - 2006 12 1
外部発表はい
イベント10th International Conference on Aluminium Alloys, (ICAA-10) - Vancouver, Canada
継続期間: 2006 7 92006 7 13

出版物シリーズ

名前Materials Science Forum
番号PART 1
519-521
ISSN(印刷版)0255-5476

Conference

Conference10th International Conference on Aluminium Alloys, (ICAA-10)
国/地域Canada
CityVancouver
Period06/7/906/7/13

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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