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Journal of Materials Science

, Volume 35, Issue 1, pp 179–189 | Cite as

Precipitation sequence of various kinds of metastable phases in Al-1.0mass% Mg2Si-0.4mass% Si alloy

  • K. Matsuda
  • Y. Sakaguchi
  • Y. Miyata
  • Y. Uetani
  • T. Sato
  • A. Kamio
  • S. Ikeno
Article

Abstract

The precipitation of three new types of metastable phases, i.e., TYPE-A, TYPE-B and TYPE-C, with different crystal structures from the β′ phase is proposed from our research on the change in crystal structures and formation sequence of metastable phases during the aging of the Al-1.0mass% Mg2Si-0.4mass% Si alloy by a combination of analytical high resolution electron microscopy and energy dispersive X-ray spectroscopy. The sequence of their formation is explained as follows. First, precipitation of the β′ phase and TYPE-B precipitate, then β′ dissolution into the matrix and degradation of the TYPE-B precipitate. Finally, predominant precipitation of the metastable TYPE-A precipitate. The TYPE-C precipitate appeared heterogeneously in the over-aged condition.

Keywords

Polymer Precipitation Spectroscopy Microscopy Electron Microscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • K. Matsuda
    • 1
  • Y. Sakaguchi
    • 2
  • Y. Miyata
    • 2
  • Y. Uetani
    • 3
  • T. Sato
    • 4
  • A. Kamio
    • 4
  • S. Ikeno
    • 5
  1. 1.Department of Materials Science and Engineering, Faculty of EngineeringToyama UniversityToyamaJapan
  2. 2.Toyama UniversityToyamaJapan
  3. 3.Research Institute for TechnologyToyama Prefectural UniversityToyamaJapan
  4. 4.Department of Metallurgical Engineering, Faculty of EngineeringTokyo Institute of TechnologyTokyoJapan
  5. 5.Department of Materials Science and Engineering, Faculty of EngineeringToyama UniversityToyamaJapan

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