Conclusions
Preliminary natural aging of Al−Zn−Mg alloys with Mn or Zr increases the strength after artificial aging; the lower the total concentration of zinc and magnesium and the lower the Zn∶Mg ratio, the greater the degree of strengthening. The Al−Zn−Mg alloys with 4.8–5.3% Zn+Mg in which the Zn∶Mg ratio is 1.5–2 and alloys with 6–6.5% Zn+Mg in which the Zn∶Mg ratio is 1–0.9 are not strengthened during artificial aging without preliminary natural aging.
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Literature cited
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Additional information
N. A. Martynova, R. M. Sizova, and Yu. N. Kukushkin collaborated in the experimental part of this investigation.
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 15–20, August, 1966.
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Elagin, V.I. Singularities of the aging of alloys of the Al−Zn−Mg system. Met Sci Heat Treat 8, 616–619 (1966). https://doi.org/10.1007/BF00648000
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DOI: https://doi.org/10.1007/BF00648000