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

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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.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Faculty of Engineering, Toyama University, 3190, Gofuku, Toyama-shi, Toyama, 930, Japan

    K. Matsuda

  2. Toyama University, 3190, Gofuku, Toyama-shi, Toyama, 930, Japan

    Y. Sakaguchi & Y. Miyata

  3. Research Institute for Technology, Toyama Prefectural University, 5180, Kurokawa, Kosugi, Imizu-gun, Toyama, 939-03, Japan

    Y. Uetani

  4. Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo, 152, Japan

    T. Sato & A. Kamio

  5. Department of Materials Science and Engineering, Faculty of Engineering, Toyama University, 3190, Gofuku, Toyama-shi, Toyama, 930, Japan

    S. Ikeno

Authors
  1. K. Matsuda
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  2. Y. Sakaguchi
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  3. Y. Miyata
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  4. Y. Uetani
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  5. T. Sato
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  6. A. Kamio
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  7. S. Ikeno
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Matsuda, K., Sakaguchi, Y., Miyata, Y. et al. Precipitation sequence of various kinds of metastable phases in Al-1.0mass% Mg2Si-0.4mass% Si alloy. Journal of Materials Science 35, 179–189 (2000). https://doi.org/10.1023/A:1004769305736

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  • DOI: https://doi.org/10.1023/A:1004769305736

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