Issues »  Volume 46, Issue 9

Increasing the Operating Temperatures of High-Strength Wrought Al–Zn–Mg–Cu Alloys by Means of Doping with Transition Metals

M. O. Iefimov, N. P. Zakharova, M. I. Danylenko, and K. O. Iefimova

I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Omeljan Pritsak Str., UA-03142 Kyiv, Ukraine

Received: 09.07.2024; final version - 12.07.2024. Download: PDF

The effect of doping with scandium, zirconium, and hafnium on the thermal stability of high-strength wrought Al–Zn–Mg–Cu (of 7XXX series) alloys at 80oС for 100 hours is investigated. The study is performed on rods produced by a two-stage hot extrusion of 1500 g ingots. As shown, the doping with scandium and zirconium has improved the hardness and strength characteristics due to the occurrence of two ensembles of dispersed precipitates: intermetallics η'-phase (MgZn2) and Al3(Sc1-xZrx) particles coherently bonded with the aluminium matrix. As proved, in the 7XXX alloy, which is additionally doped with the (Sc + Zr + Hf) complex, the composition of nanosize precipitates based on Al3Sc intermetallic compound includes zirconium and hafnium. The alloying of the base alloy with the complex (Sc + Zr + Hf) stabilizes the structural state of the alloy and, after holding at 80oС, no significant changes in the size and distribution of strengthening particles are observed. This makes it possible to obtain high strength characteristics of Al–Zn–Mg–Cu alloys with a high level of plasticity at long-term holding at 80oС.

Key words: aluminium alloys, additional doping, scandium, zirconium, hafnium, mechanical properties.

URL: https://mfint.imp.kiev.ua/en/abstract/v46/i09/0881.html

DOI: https://doi.org/10.15407/mfint.46.09.0881

PACS: 61.66.Dk, 61.72.Ff, 62.20.Qp, 64.75.Nx, 81.30.Mh, 81.40.Cd, 81.40.Ef

Citation: M. O. Iefimov, N. P. Zakharova, M. I. Danylenko, and K. O. Iefimova, Increasing the Operating Temperatures of High-Strength Wrought Al–Zn–Mg–Cu Alloys by Means of Doping with Transition Metals, Metallofiz. Noveishie Tekhnol., 46, No. 9: 881—891 (2024)

REFERENCES
  1. B. Zhou, B. Liu, and S. Zhang, Metals, 11, Iss. 5: 718 (2021).
  2. M. Ashjari and A. J. Feizi, Mater. Sci. Eng. Int. J., 2, Iss. 2: 49 (2018).
  3. Yu-guo Liao, Xiao-qi Han, Miao-xia Zeng, and Man Jin, Mater. Design, 66, Pt. B: 581 (2015).
  4. Yu. V. Milman, Vliyanie Skandiya na Strukturu, Mekhanicheskie Svoistva i Soprotivlenie Korrozii Splavov Alyuminiya [The Influence of Scandium on the Structure, Mechanical Properties and Corrosion Resistance of Aluminium Alloys] (Kiev: Akademperiodika: 2003), vol. 1, p. 335 (in Russian).
  5. X. Dai, C. Xia, X. Peng, and K. Ma, J. Univ. Sci. Technol. B, 15, Iss. 3: 276 (2008).
  6. Yu. V. Milman, A. I. Sirko, D. V. Lotsko, O. N. Senkov, and D. B. Miracle, Mater. Sci. Forum, 396–402: 1217 (2002).
  7. D. V. Lotsko, Yu. V. Milman, N. A. Efimov, A. P. Rachek, and L. N. Trofimova, Met. Phys. Adv. Tech., 19, Iss. 6: 783 (2001).
  8. Yu. V. Milman, D. V. Lotsko, N. A. Iefimov, N. M. Mordovets, A. P. Rachek, and L. N. Trofimova, Metallofiz. Noveishie Tekhnol., 26, No. 10: 1363 (2004) (in Russian).
  9. E. Lavernia, G. Rai, and N. J. Grant, Mater. Sci. Eng., 79, Iss. 2: 211 (1986).
  10. Y. Dai, L. Yan, and J. Hao, Mater., 15, Iss. 3: 1216 (2022).
  11. L. F. Mondolfo, Aluminum Alloys: Structure and Properties (London–Boston: Butterworths Publisher: 1976), p. 11.
  12. U. Tenzler and E. Cyrener, Aluminium, 75, No. 6: 524 (1999).
  13. G. Sha and A. Cerezo, Surf. Interface Analysis, 36, Iss. 5–6: 564 (2004).
  14. M. F. Ashby and L. M. Brown, Phil. Mag., 8, No. 91: 1083 (1963).
  15. Yu. V. Milman, Metallofiz. Noveishie Tekhnol., 27, No. 1: 59 (2005) (in Russian).

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