On the Hierarchy of Structural-Phase States of 1561 Aluminum Alloy

Abstract:

An experimental issue of studying the structural and deformation properties of an initially anisotropic 1561 alloy within a wide temperature-rate range is considered. In the course of realization of the experiments on “Gagarin’s” samples cut out in the rolling direction, the circular cross sections of the samples took an elliptical form. As a macro-characteristic of the material reflecting the occurring structural changes, the anisotropy factor is taken, which is represented by the ratio of deformations measured along the small and large axes of the cross section. Previously unknown regularities of the change in the anisotropy factor were established at the temperature increase under different values of the degree and strain rate. An essential dependence of the anisotropy factor on the thermomechanical conditions of deformation is noted. At high homological temperatures, the thermal range corresponding to the manifestation of superplastic properties is identified. Here, the anisotropy index tends to a minimum value. A correspondence between the results of mechanical experiments and the study of the structural state of the alloy was established. The obtained results indicate the dependence of the anisotropy factor on the initial structure of the alloy. The anisotropy factor can be taken as one of the macroparameters of the material that correspond to structural transformations and allow one to quantify the degree and completeness of structural changes relative to the initial state in a changing field of temperatures and strain rates.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 325-330
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.325
• Online since: July 2018
• Authors: Shakir T. Pazylov*
• Keywords: Aluminium Alloy, Anisotropy Factor, Dynamic Superplasticity, Phase Transformations

References

[1] S.S. Ushkov, D.I. Chashnikov, The term superplasticity, in wide and narrow meanings, Ship-building industry. Series materials science. 13 (1990) 11-21.

[2] A.I. Rudskoy, Ya.I. Rudaev, Mechanics of dynamic superplasticity of aluminum alloys, Nauka, St.Petersburg, (2009).

[3] А.P. Gulyaev, Superplasticity of Steel, Metallurgiya, Moscow, (1982).

[4] A.A. Presnyakov, U.K. Duysenbaev, The Concept of Superplastic Flow of Metals and Alloys, Signet-Print, Almaty, (2006).

[5] R.K. Aubakirova, A.A. Presnyakov, S.S. Ushkov, A.N. Baideldinova, Superplasticity of Some Titanium Alloys, Nauka, Almaty, (1987).

[6] A.A. Gvozdev, Production of Blanks of High-Speed Tools in Conditions of Superplasticity, Mechanical Engineering, Moscow, (1992).

[7] V.I. Kuneev, Ya.I. Rudaev, A.G. Popov, N.V. Zhdanov, Superplasticity of some materials under compression, Journal of Applied Mechanics and Technical Physics. 17 (3) (1976) 410-412.

DOI: 10.1007/bf00853578

[8] Ya.I. Rudaev, Phase transitions in superplasticity, Strength of Materials. 22 (10) (1990) 1445-1451.

DOI: 10.1007/bf00767229

[9] O.A. Kaibyshev, Superplasticity of commercial alloys, Metallurgiya, Moscow, (1984).

[10] G. Gladyshev, Thermodynamics and macrokinetics of natural hierarchic processes, Nauka, Moscow, (1988).

[11] A. Olemskoy, A. Kaznel'son, Synergetics of condensed medium (URSS, Moscow, 2003).

[12] D.A. Kitaeva, Ya.I. Rudaev, Macrokinetics heirarhies of states at dynamic superplasticity, Materials Science Forum. 575-578 (2008) 340–344.

DOI: 10.4028/www.scientific.net/msf.575-578.340

[13] Sh.T. Pazylov, N.A. Omorov, A.K. Arzimatov, Deformation Anisotropy and Superplasticity of Aluminum Alloys, Vestnik Kyrgyz-Russian Slavic University. 10 (2010) 144-148.

[14] Sh.T. Pazylov, N.A. Omorov, Ya.I. Rudaev, On deformation anisotropy of Aluminum Alloys // Tambov University Reports. Series Natural and Technical Sciences. 15 (3) (2010) 974-976.

[15] Kitaeva D.A., Rudaev Ya.I., Pazylov Sh.T., Kodzhaspirov G.E., On anisotropy factor assessment for aluminum alloys under high temperature creep, in: Proceedings of the 14th International Conference on Creep and Fracture of Engineering Materials and Structures (Creep2017), Publishing House of Polytechnical University, St.Petersburg, 2017, pp.74-75.

[16] Sh.T. Pazylov, Structural Changes in 1561 Aluminum Alloy under Conditions of Temperature-rate Deformation, Vestnik Kyrgyz-Russian Slavic University. 5 (2015) 116-119.

[17] D.A. Kitaeva, Sh.T. Pazylov, Ya.I. Rudaev, Temperature-strain rate deformation conditions of aluminum alloys, Journal of Applied Mechanics and Technical Physics. 57 (2) (2016) 352-358.

DOI: 10.1134/s002189441602019x

[18] D. Kitaeva, G. Kodzhaspirov, Y. Rudaev, On structural transformations in aluminum alloy deformation, in: Proceedings of the 25th Anniversary International Conference on Metallurgy and Materials (METAL 2016), TANGER Ltd., Brno, 2016, pp.1426-1431.