Abstract
The structural and phase transformations have been studied in aging commercial aluminum-lithium alloy Al-1.2 Li-3.2 Cu-0.09 Zr-0.11 Sc-0.4 Ag-0.3 Mg in the as-delivered state and after severe plastic deformation by torsion for 1, 5 and 10 revolutions under a high pressure of 4 GPa. Deformation-induced nanofragmentation and dynamic recrystallization have been found to occur in the alloy. The degree of recrystallization increases with deformation. Nanofragmentation and recrystallization processes are accompanied by the deformation-induced decomposition of solid solution and changes in both the nucleation mechanism of precipitation and the phase composition of the alloy. The influence of a nanostructured nanophase state of the alloy on its mechanical properties (microhardness, plasticity, elastic modulus, and stiffness) is discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I. J. Polmear and R. J. Chester, “Abnormal age hardening in an Al-Cu-Mg alloy containing silver and lithium,” Scr. Metall. 32, 1213–1217 (1989).
I. J. Polmear, G. Pons, Y. Barbaux, H. Octor, C. Sanchez, A. J. Morton, W. E. Borbidge, and S. Rogers, “After Concorde: Evaluation of creep resistant Al-Cu-Mg-Ag alloys,” Mater. Sci. Technol. 15, 861–868 (1999).
L. I. Kaigorodova, B. P. Domashnikov, and O.D. Shashkov, “Effect of small silver additions on the structure and properties of aluminum-magnesium alloy upon prolonged natural aging,” Fiz. Met. Metalloved. 67, 186–192 (1989).
L. I. Kaigorodova, V. G. Pushin, D. Yu. Rasposienko, and V. P. Pilyugin, “Effect of severe plastic deformation on the formation of the nanocrystalline structure and the aging of the multicomponent aluminum-lithium alloy with small additions of Sc and Mg,” Phys. Met. Metallogr. 111, 72–79 (2011).
W. S. Oliver and G. M. Pharr, “An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments,” J. Mater. Res. 7, 1564–1583 (1992).
Yu. V. Milman, “Plasticity characteristic obtained by indentation,” J. Phys. 41, 1–9 (2008).
E. I. Lavernia and F. A. Mohamed, “Strength, deformation, fracture behavior and ductility of aluminumlithium alloys,” J. Mater. Sci., 25, 1137–1158 (1990).
A. K. Mukhopadhyay, G. Eggler, and B. Scrotzki, “Nucleation of ω phase in an Al-Cu-Mg-Mn-Ag aged at temperatures below 200°C,” Scr. Mater. 44, 545–551 (2001).
J. M. Howe, J. Lee, and A. K. Vasudevan, “Structure and deformation behavior of T1 precipitates plates in an Al-2Li-1Cu alloy,” Metall. Trans. A 19, 2911–2920 (1988).
J. C. Huang and A. J. Ardell, “Crystal structure and stability of T 1 precipitates in aged Al-Li-Cu Alloys,” Mater. Sci. Technol. 3, 176–188 (1987).
V. V. Rybin, Large Plastic Deformations and Fracture of Metals (Metallurgiya, Moscow, 1986) [in Russian].
L. I. Kaigorodova, D. Yu. Rasposienko, V. G. Pushin, and V. P. Pilyugin, “Effect of storage on the stability of the grained structure and phase transformations in the nanocrystalline alloy 1450 doped with Sc and Mg,” Phys. Met. Metallogr. 113, 867–877 (2012).
V. G. Gryaznov and L. I. Trusov, “Size effects in micromechanics of nanocrystals,” Prog. Mater. Sci. 37, 289–401 (1993).
L. I. Kaigorodova, D. Yu. Rasposienko, V. G. Pushin, and V. P. Pilyugin, “Peculiarities of structure and properties of alloy based on the Al-Li-Cu-Zr system and subjected to severe plastic deformation by torsion under pressure,” Deform. Razrush., No. 6, 21–29 (2013).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © L.I. Kaigorodova, D.Yu. Rasposienko, V.G. Pushin, V.P. Pilyugin, S.V. Smirnov, 2015, published in Fizika Metallov i Metallovedenie, 2015, Vol. 116, No. 4, pp. 366–376.
Rights and permissions
About this article
Cite this article
Kaigorodova, L.I., Rasposienko, D.Y., Pushin, V.G. et al. Structure and mechanical properties of aging Al-Li-Cu-Zr-Sc-Ag alloy after severe plastic deformation by high-pressure torsion. Phys. Metals Metallogr. 116, 346–355 (2015). https://doi.org/10.1134/S0031918X15040080
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X15040080