Журналы →  Non-ferrous Мetals →  2017 →  №1 →  Назад

Название Physical and computer simulation of severe plastic deformations on shear-compression testing of AMg6 (АМг6) aluminium alloy
DOI 10.17580/nfm.2017.01.04
Автор Pesin A. M., Pustovoytov D. O., Steblyanko V. L., Fedoseev S. A.
Информация об авторе

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

A. M. Pesin, Professor
D. O. Pustovoytov, Assistant Professor, e-mail: pustovoitov_den@mail.ru
V. L. Steblyanko, Professor


Perm National Research Polytechnic University, Perm, Russia:
S. A. Fedoseev, Professor, Chair of Computational Mathematics and Mechanics


A deformable AMg6 (АМг6) aluminum alloy of Al – Mg system is characterized by good plasticity, high corrosion stability and good welding capacity. That’s why it is widely used in welded constructions of rockets and space vehicles. However, the essential weakness of AMg6 alloy is its rather low strength. Therefore, the topical task is a development of new non-cutting shaping technologies which can guarantee the improved strength properties of AMg6 alloy. One of the possible ways to solve this problem is to form in the melt a fine-graded or ultrafine-graded structure through the application of severe plastic shear-compression deformations by asymmetric cold rolling technology. To emulate such a technology and to define optimal deformation parameters, which provide the fine-graded or ultrafine-graded structure formation, a technique of high-cycle deformation of laboratory specimens according to a shear-compression scheme has been implemented on a Shimadzu AG-IC 300 kN precision universal testing machine. Special specimens have been produced in the shape of parallelepipeds 50 mm in height with a square cross-section of dimension 2525 mm with two parallel notches in 6 mm wide and 10 mm depth, implemented at the side surface at angle of 45 degrees to vertical axis with fillet radii of 3 mm. The objective of this work has been to experimentally test this technique and to study the distinctive features of changes of the AMg6 structural alloy structure and microhardness on achievement severe plastic deformations during shear-compression testing. As a result of the carried out investigations, it is established that ultimate plastic strains of the AMg6 aluminum alloy in a cold state are restricted by the value of true deformation e = 1, on achievement of which the cracks formation and material destruction take place. It is shown that high-cycle warm deformation of the AMg6 aluminum alloy in a shear-compression scheme with achieving severe plastic deformation e = 4 at a temperature of 200 oС leads to formation of fine-graded structure and significant increase of HV microhardness up to ~1350 MPa.

M. K. Sverdlik has participated in the investigations.
The research has been implemented at the expense of the grant of the Russian Science Foundation (project No. 15-19-10030).

Ключевые слова Aluminum alloy, severe plastic deformation, shear-compression testing, physical simulation, finite-element method, microstructure, microhardness
Библиографический список

1. Bronz A. V., Efremov V. I., Plotnikov A. D., Chernyavskiy A. G. Alloy 1570C — material for pressurized structures of advanced reusable vehicles of RSC Energia. Kosmicheskaya tekhnika i tekhnologii. 2014. No. 4 (7). pp. 62–67.
2. Davydov V. G. On some urgent problems of development of aluminum alloys and processes for aerospace application. Izvestiya vuzov. Tsvetnaya metallurgiya. 2001. No. 4. pp. 32–36.
3. Chuvildeev V. N., Gryaznov M. Yu., Kopylov V. I., Sysoev A. N., Ovsyannikov B. V., Flyagin A. A. Mechanical properties of microcrystalline AMB6 aluminum alloy. Vestnik Nizhegorodskogo universiteta imeni N. I. Lobachevskogo. 2008. No. 4. pp. 35–42.
4. Park J. J. Finite-element analysis of severe plastic deformation in differential-speed rolling. Computational Materials Science. 2015. Vol. 100. pp. 61–66.
5. Ji Y. H., Park J. J. Development of severe plastic deformation by various asymmetric rolling processes. Materials Science and Engineering: A. 2009. Vol. 499. pp. 14-17.
6. Zuo F., Jiang J., Shan A. Shear deformation and grain refinement in pure Al by asymmetric rolling. Transactions of Nonferrous Metals Society of China. 2008. Vol. 18. pp. 774–777.
7. Jianhua Jiang, Yi Ding, Fangqing Zuo, Aidang Shan. Mechanical properties and microstructures of ultrafine-grained pure aluminum by asymmetric rolling. Scripta Materialia. 2009. Vol. 60. pp. 905–908.
8. Lorentz Z., Young Gun Ko. Microstructure evolution and mechanical properties of severely deformed Al alloy processed by differential speed rolling. Journal of Alloys and Compounds. 2012. Vol. 536S. pp. S122–S125.
9. Bobor K., Hegedus Z., Gubicza J., Barkai I., Pekker P., Krallics G. Microstructure and mechanical properties of Al 7075 alloy processed by differential speed rolling. Periodica Polytechnica Mechanical Engineering. 2012. Vol. 56. pp. 111–115.
10. Pesin A., Pustovoytov D., Korchunov A., Wang K., Tang D., Mi Z. Finite element simulation of shear strain in various asymmetric cold rolling processes. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2014. No. 4 (48). pp. 32–40.
11. Loorentz, Ko Y. G. Effect of differential speed rolling on microstructure and mechanical properties of nanostructured 5052 Al alloy. Journal of Alloys and Compounds. 2014. Vol. 586. pp. S205–S209.
12. Cui Q., Ohori K. Grain refinement of high purity aluminum by asymmetric rolling. Materials Science and Technology. 2000. Vol. 16. pp. 1095–1101.
13. Pesin A., Pustovoytov D. FE Analysis of the Applicability of the Shear-Compression Testing to the Modeling of the Asymmetric Rolling Process. Materials Science Forum. 2016. Vol. 870. pp. 226–233.
14. Rittel D., Lee S., Ravichandran G. A shear-compression specimen for large strain testing. Experimental Mechanics. 2002. Vol. 42. pp. 58–64.
15. Dorogoy A., Rittel D., Godinger A. Modification of the shear-compression specimen for large strain testing. Experimental Mechanics. 2015. Vol. 55. pp. 1627–1639.
16. Kozulin A. A., Krasnoveykin V. A., Skripnyak V. V., Khandaev B. V., Li Yu. V. Mechanical properties of aluminium magnesium alloys after processing by a severe plastic deformation method. Sovremennye problemy nauki i obrazovaniya. 2013. No. 6. Available at: https://science-education.ru/ru/article/view?id=11300.

Полный текст статьи Получить