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A TEM study of microstructural changes during retrogression and reaging in 7075 aluminum

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Abstract

Microstructural changes occurring during retrogression, and during retrogression plus reaging in 7075-T6 aluminum alloy have been investigated by means of transmission electron microscopy, and related to mechanical properties. TEM results indicate that the drop in strength during the initial stage of retrogression was due to the partial dissolution of G.P. zones while the growth of the semi-coherentη ′ was responsible for the rapid recovery of strength. It is suggested that the retrogression and reaging treatment resulted in the increase in volume fraction of G.P. zones and especially η′ precipitates over both the T6 and retrogressed conditions, therefore significantly improving the strength of the alloy.

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Authors and Affiliations

  1. National Aeronautical Establishment, National Research Council Canada, K1A 0R6, Ottawa, Ontario, Canada

    Nguyen Cong Danh (Research Associate), Krishna Rajan (Research Officer) & W. Wallace (Section Head)

Authors
  1. Nguyen Cong Danh
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  2. Krishna Rajan
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  3. W. Wallace
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Danh, N.C., Rajan, K. & Wallace, W. A TEM study of microstructural changes during retrogression and reaging in 7075 aluminum. Metall Trans A 14, 1843–1850 (1983). https://doi.org/10.1007/BF02645554

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  • DOI: https://doi.org/10.1007/BF02645554

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