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The Temperature Limit for GP Zone Formation in an Al-Zn-Mg Alloy

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Abstract

The temperature limit for GP zone formation, Tlimit was determined for an Al-5 pct Zn-2 pct Mg alloy by examining the formation process of the intermediate phase. Studies of changes in hardness and electrical resistivity, together with electron metallography permitted a conclusion that the Tlimit for this alloy is 125 °C. The nucleation mechanism of the intermediate phase is also discussed. Two types of precipitation mode were found the partly coherent phase;i.e. heterogeneous nucleation on GP zones and homogeneous nucleation respectively. It is concluded that the dominant nucleation mode is determined by the quenching conditions.

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Authors and Affiliations

  1. Tokyo Institute of Technology, Tokyo

    H. Inoue, T. Sato (Assistant Researcher) & Y. Kojima

  2. Tokyo Institute of Technology, Tokyo

    T. Takahashi (Professor)

Authors
  1. H. Inoue
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  2. T. Sato
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  3. Y. Kojima
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  4. T. Takahashi
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formerly with Graduate School of Tokyo Institute of Technology, is now with Kobe Steel Ltd., Nagoya

formerly with Tokyo Institute of Technology, is now Associate Professor, The Technological University of Nagaoka, Nagaoka.

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Inoue, H., Sato, T., Kojima, Y. et al. The Temperature Limit for GP Zone Formation in an Al-Zn-Mg Alloy. Metall Trans A 12, 1429–1434 (1981). https://doi.org/10.1007/BF02643687

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  • DOI: https://doi.org/10.1007/BF02643687

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