DOI: 10.18503/1995-2732-2025-23-4-71-79
Abstract
Problem Statement (Relevance). Aluminum nonheat-treatable alloys of the aluminum-magnesium-scandium system are characterized by good weldability, high mechanical properties, relatively low density, and the absence of strengthening heat treatment (such as quenching and aging). However, the high cost of these alloys hinders their use in various industries. Therefore, it is necessary to develop processing methods that can increase the yield of the finished product with the expensive Al-2%Sc masteralloy. However, due to the low technological plasticity of 5XXX series aluminum alloys, edge cracking of sheets or strips occurs during hot rolling, which requires increasing the fractional deformation. This, in turn, affects the final cost of the semi-finished hot-rolled product. Accordingly, studying changes in the technological plasticity of 5XXX series aluminum alloys during rolling is relevant. Objectives. The work is aimed at determining the parameters of the asymmetric rolling process, in particular the rolls speed ratio, during processing the 5XXX series aluminum alloy with scandium, ensuring an increase in the technological plasticity of the material while reducing the force during hot rolling maintaining the level of mechanical properties after cold rolling. Methods Applied. Hot and cold rolling were carried out on a unique industrial and laboratory mill DUO 400 of the Zhilyaev Laboratory of Mechanics of Gradient Nanomaterials of the NMSTU. The forces arising during rolling were recorded by the software of the DUO 400 mill. The quality of the obtained semi-finished rolled products was assessed in accordance with GOST R 57510-2017. Surface hardness was determined by the Brinell method in accordance with GOST 9012-59. Mechanical properties were assessed in accordance with the ASTM E8 standard. Results. At the rolls speed ratio V1/V2 in the range of 1.1-1.3, no defects were observed during hot rolling. The rolling force decreased from 1400 kN to 1280 kN. The technological plasticity increased, as evidenced by the decreased probability of edge cracking with an increase in the percent reduction during hot rolling. The values of mechanical properties after cold rolling (σv, σ0.2, δ) varied within the range of 421-464 MPa for ultimate strength σv, 373-416 MPa for yield strength σ0.2, and 2-7% for relative elongation δ. Practical Relevance. Asymmetric rolling affects the change in the technological plasticity of 5XXX series aluminum alloy with the expensive Al-2%Sc masteralloy. As a result, the number of passes during finish hot rolling can be reduced (to one). This eliminates additional edge cooling and cracking, and also has a positive effect on the cost of semi-finished hot-rolled products and their production time.
Keywords
aluminum alloy 1580, asymmetric rolling, hot rolling, scandium, semi-finished hot-rolled products, scandium-containing alloy, flat rolled products, rolling force, technological plasticity
For citation
Nikitina M.A., Pustovoytov D.O., Biryukova O.D., Pesin I.A., Baryshnikova A.M., Nosov L.V. The Effect of the Speed Asymmetry on Technological Plasticity of the Aluminum-Magnesium-Scandium System Alloy During Rolling. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2025, vol. 23, no. 4, pp. 71-79. https://doi.org/10.18503/1995-2732-2025-23-3-71-79
1. Filatov Yu.A. Aluminum alloys of the Al–Mg–Sc system for space technology. Tekhnologiya legkikh splavov [Technology of Light Alloys]. 2013;(4):61-65. (In Russ.)
2. Zakharov V.V., Filatov Yu.A. Modern trends in the development of aluminum alloys alloyed with scandium. Tekhnologiya legkikh splavov [Technology of Light Alloys]. 2022;(3):9-18. (In Russ.)
3. Filatov Yu.A. Development of ideas on scandium alloying of Al-Mg alloys. Tekhnologiya legkikh splavov [Technology of Light Alloys]. 2015;(2):19-22. (In Russ.)
4. Filatov Yu.A., Elagin V. I., Zakharov V.V., Panasyugina L.I., Dobrozhinskaya R.I. et al. Kriogenniy deformiruemiy termicheski neuprochnyaemiy splav na osnove alyuminiya [Cryogenic deformable non-heat-treatable aluminum-based alloy]. Patent RU, no. 2343218, 2009.
5. Zakharov V.V., Filatov Yu.A., Drits A.M. Possibilities of increasing the strength properties of large-sized semi-finished products made of Al–Mg–Sc alloys. Tekhnologiya legkikh splavov [Technology of Light Alloys]. 2023;(4):34-41. (In Russ.)
6. Nikitina M., Gradoboev A., Ryabov D., Vakhromov R., Mann V., Krokhin A. Effektivnost Sc dlya uprochneniya i uluchsheniya formuemosti listov BIW 5HKHKH [Efficiency of Sc for strengthening and formability improvement of BIW 5XXX sheets]. In: Light Metals 2023, ed. by S. Broek. TMS, 2023. (In Russ.)
7. Liddicoat P. V., Liao Xiao-Zhou, Zhao Y. et al. Nanostructural hierarchy increases the strength of aluminum alloys. Nature Communications, 2010;63:1-7.
8. Willey L.A. Aluminum scandium alloy. Patent US, no. 3619181, 1971.
9. Drits M.E., Toropova L.S., Bykov Yu.G., Elagin V.I., Filatov Yu.A. Structure and properties of Al–Sc and Al–Mg–Sc alloys. Metallurgiya i metallovedenie tsvetnyh splavov [Metallurgy and Metal Science of Non-Ferrous Alloys]. Moscow: Nauka, 1982. Pp. 213-223. (In Russ.)
10. Zakharov V.V., Elagin V.I., Rostova T.D., Filatov Yu.A. Metallurgical principles of scandium alloying of aluminum alloys. Tekhnologiya legkikh splavov [Technology of Light Alloys]. 2010;(1):67-73. (In Russ.)
11. Kondratyeva N.B., Zolotorevsky Yu.S., Aliyeva S.G., Altman M.B., Ambartsumyan S.M. Splavy alyuminiya s magniem (magnalii). V kn.: Promyshlennye alyuminievye splavy: spravochnoe izdanie [Aluminum alloys with magnesium (magnalium). In: Industrial Aluminum Alloys: reference book]. Moscow: Metallurgiya, 1984, pp. 37-51. (In Russ.)
12. Pesin A.M., Pustovoitov D.O., Pesin I.A., Kozhemyakina A.E., Nosov L.V., Sverchkov A.I. Development of technological schemes for asymmetric rolling of aluminum strips with increased strength and ductility. Teoriya i tekhnologiya metallurgicheskogo proizvodstva [Theory and Technology of Metallurgical Production]. 2022;41(2):32-40. (In Russ.)
13. Zhi C.C., Wu Z.Y., Ma L.F., Huang Z. Q., Zheng Z.B., Xu H., Jia W.T., Lei J.Y. Effect of thickness ratio on interfacial structure and mechanical properties of Mg/Al composite plates under differential-temperature asymmetric rolling. Journal of Materials Research and Technology. 2023;24:8332-8347.
14. Amegadzie M.Y., Bishop D.P. Effect of asymmetric rolling on the microstructure and mechanical properties of wrought 6061 aluminum. Materials Today Communications. 2020;(25):101283.
15. Zhao Qilin, Hu Xianlei, Liu Xianghua. Analysis of mechanical parameters in multi-pass asymmetrical rolling of strip using the slab method. Materials. 2023;16(18):6286.
16. State standard GOST Р 57510-2017. Rolled products made of aluminum alloys. Terms and definitions of defects. Moscow: Standartinform, 2017, 52 р. (In Russ.)
17. State standard GOST 9012-59. Metals. Brinell hardness measurement method. Moscow: Standartinform, 2007, 39 р. (In Russ.)