Conclusions
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1.
Small additions of zirconium (and particularly chromium) substantially increase the variation of the strength with the time interval between quenching and artificial aging of Al−4.5 Zr−2.0 Mg−0.35 Mn, which is due to the increased surface of subgrain boundaries and the interface between the matrix and the intermetallic compound of aluminum and the transition metal.
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2.
Small additions of copper reduce the variation of the strength with the time interval between quenching and artificial aging.
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Literature cited
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Additional information
All-Union Institute of Light Alloys. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 61–62, May, 1971.
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Zakharov, V.V., Levin, L.I. & Romanova, G.M. The effect of “rest” on artificial aging of Al−Zn−Mg−Mn alloys. Met Sci Heat Treat 13, 418–419 (1971). https://doi.org/10.1007/BF00652455
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DOI: https://doi.org/10.1007/BF00652455