Abstract
Sheets from the aluminum alloy 1421 with an ultrafine-grained (UFG) structure and a weak crystallographic texture were prepared by the method of equal-channel angular pressing (ECAP) through a die with channels of a rectangular cross section and by subsequent isothermal rolling. Both operations were carried out at a temperature of 325°C. It is shown that severe plastic deformation (SPD) leads to the formation of a completely recrystallized uniform microstructure with an average grain size of 1.6 µm in the alloy. At room temperature the alloy 1421 demonstrates high static strength (σu = 545 MPa, σ0.2 = 370 MPa) in the absence of a significant anisotropy. At temperatures of hot deformation, the alloy showed ultrahigh elongations under superplasticity (SP) conditions. At a temperature of 450°C and initial deformation rate of 1.4 × 10−2 s−1 the maximum elongation at fracture was ∼2700%. At static annealing at a temperature of SP deformation, the UFG structure formed in the process of SPD remains stable. The SP deformation is accompanied by an insignificant grain growth and pore formation.
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References
I. N. Fridlyander, K. V. Chuistov, A. L. Berezina, and N. I. Kolobnev, “Aluminum-Lithium Alloys,” in Structure and Properties (Naukova Dumka, Kiev, 1992) [in Russian].
I. N. Fridlyander, L. B. Khokhlatova, N. I. Kolobnev, et al., “Development of Stable Aluminum Alloy 1424 for Applications in Welded Fuselages,” Metalloved. Term. Obrab. Met., No. 1, 1–9 (2002).
F. Musin, R. Kaibyshev, Y. Motohashi, et al., “High Strain Rate Superplasticity in an Al-Li-Mg Alloy Subjected to Equal-Channel Angular Extrusion,” Mater. Trans. 43(10), 2370–2377 (2002).
R. Kaibyshev, K. Shipilova, F. Musin, and Y. Motohashi, “Achieving High Strain Rate Superplasticity in an Al-Li-Mg-Sc Alloy through Equal-Channel Angular Extrusion,” Mater. Sci. Technol. 21(4), 408–418 (2005).
R. Kaibyshev, K. Shipilova, F. Musin, and Y. Motohashi, “Continuous Dynamic Recrystallization in an Al-Li-Mg-Sc Alloy during Equal-Channel Angular Extrusion,” Mater. Sci. Eng., A 396, 341–351 (2005).
V. M. Segal, “Engineering and Commercialization of Equal Channel Angular Extrusion,” Mater. Sci. Eng., A 386, 269–276 (2004).
R. Z. Valiev, R. K. Islamgaliev, and I. V. Alexandrov, “Bulk Nanostructured Materials from Severe Plastic Deformation,” Prog. Mater. Sci. 45, 103–189 (2000).
M. Kamachi, M. Furukawa, Z. Horita, and T. G. Langdon, “Equal-Channel Angular Pressing Using Plate Samples,” Mater. Sci. Eng., A 361, 258–266 (2003).
I. Nikulin, R. Kaibyshev, and T. Sakai, “Superplasticity in a 7055 Aluminum Alloy Processed by ECAE and Subsequent Isothermal Rolling,” Mater. Sci. Eng., A 407, 62–70 (2005).
Z. Horita, M. Furukawa, M. Nemoto, and T. G. Langdon, “Development of Fine Grained Structures Using Severe Plastic Deformation,” Mater. Sci. Technol. 16, 1239–1245 (2000).
F. J. Humphreys, P. B. Prangnell, J. R. Bowen, et al., “Developing Stable Fine-Grain Microstructures by Large Strain Deformation,” Philos. Trans. R. Soc. London A 357, 1663–1681 (1999).
J. Pilling and N. Ridley, Superplasticity in Crystalline Solids (The Institute of Metals, London, 1989).
O. A. Kaibyshev, Superplasticity of Alloys, Intermetallics, and Ceramics (Springer, Berlin, 1992).
M. Furukawa, Z. Horita, M. Nemoto, et al., “Factors Influencing the Flow and Hardness of Materials with Ultrafine Grain Sizes,” Philos. Mag. 78(1), 203–215 (1998).
K. T. Park, H. J. Lee, C. S. Lee, et al., “Enhancement of High Strain Rate Superplastic Elongation of a Modified 5154 Al by Subsequent Rolling after Equal Channel Angular Pressing,” Scr. Mater. 51, 479–483 (2004).
H. Akamatsu, T. Fujinami, Z. Horita, and T. G. Langdon, “Influence of Rolling on the Superplastic Behavior of an Al-Mg-Sc Alloy after ECAP,” Scr. Mater. 44, 759–764 (2001).
K. T. Park, H. J. Lee, Ch. S. Lee, and D. H. Shin, “Effect of Post-Rolling after ECAP on Deformation Behavior of ECAPed Commercial Al-Mg Alloy at 723 K,” Mater. Sci. Eng., A 393, 118–124 (2005).
R. Kaibyshev, F. Musin, E. Avtokratova, and Y. Motohashi, “Deformation Behavior of a Modified 5083 Aluminum Alloy,” Mater. Sci. Eng., A 392, 373–379 (2005).
O. V. Mishin, D. Juul Jensen, and N. Hansen, “Microstructures and Boundary Populations in Materials Produced by Equal Channel Angular Extrusion,” Mater. Sci. Eng., A 342, 320–328 (2003).
H. Jazaeri and F. J. Humphreys, “The Transition from Discontinuous to Continuous Recrystallization in Some Aluminium Alloys: I. The Deformed State,” Acta Mater. 52, 3239–3250 (2004).
H. Jazaeri and F. J. Humphreys, “The Transition from Discontinuous to Continuous Recrystallization in Some Aluminium Alloys: II. Annealing Behaviour,” Acta Mater. 52, 3251–3262 (2004).
M. Ferry, N. E. Hamilton, and F. J. Humphreys, “Continuous and Discontinuous Grain Coarsening in a Fine-Grained Particle-Containing Al-Sc Alloy,” Acta Mater. 53, 1079–1109 (2005).
V. I. Elagin, “The State an the Ways of Enhancement of Fracture Strength of High-Strength Aluminum Alloys,” Metalloved. Term. Obrab. Met., No. 9, 10–17 (2002).
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Original Russian Text © A.A. Mogucheva, R.O. Kaibyshev, 2008, published in Fizika Metallov i Metallovedenie, 2008, Vol. 106, No. 4, pp. 439–448.
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Mogucheva, A.A., Kaibyshev, R.O. Structure and properties of aluminum alloy 1421 after equal-channel angular pressing and isothermal rolling. Phys. Metals Metallogr. 106, 424–433 (2008). https://doi.org/10.1134/S0031918X0810013X
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DOI: https://doi.org/10.1134/S0031918X0810013X