Conclusions
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1.
The basic hardening phase of casting Al-Mg-Zn alloys is the T-phase (Al2Mg3Zn3), which is segregated at temperatures from 160 to 170°C. On heating to 190°C and higher, the β-phase (Al3Mg2) begins to form — along the subgrain boundaries at first, and over the entire body of the grain at temperatures above 200°C.
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2.
Coagulation of T-phase particles and growth of the β-phase lead to a reduction in the strength properties of an aluminum alloy containing 5.5% Mg and 2.5% Zn.
The best set of properties for this alloy corresponds to the T→β-phase transformation, which is observed after aging at 80°C for 8 h +190°C for 2 h. This aging regime is characterized by the homogenous segregation of highly disperse particles of the hardening phases T′ and T uniformly over the body of the grain.
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Literature cited
Dznong Legon, Krist. Technik,15, No. 6, 697–702 (1980).
Le Kong Zyong, Yu. A. Skakov, and E. V. Shelekhov, "Structural changes during aging of a casting aluminum alloy containing 3.5% Zn and 4% Mg," Izv. Akad. Nauk SSSR, Met., No. 3, 124–130 (1981).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 56–57, March, 1985.
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Parkhomenko, N.A., Gerchikova, N.S., Cherkasov, V.V. et al. Structure and properties of castings of the Al-Mg-Zn system. Met Sci Heat Treat 27, 233–236 (1985). https://doi.org/10.1007/BF00699661
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DOI: https://doi.org/10.1007/BF00699661