Features of structure formation processes in AA2024 alloy joints formed by the friction stir welding with bobbin tool

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 2 2021 20. Seidel T.U., Reynolds A.P. Visualization of the material flow in AA2195 friction-stir welds using a marker insert technique. Metallurgical and Materials Transactions A , 2001, vol. 32, pp. 2879–2884. DOI: 10.1007/s11661- 001-1038-1. 21. Zhu Z., Wang M., Zhang H., Zhang X., Yu T., Wu Z. A finite element model to simulate defect formation during friction stir welding. Metals , 2017, vol. 7, p. 256. DOI: 10.3390/met7070256. 22. Tamadon A., Pons D.J., Sued K., Clucas D. Formation mechanisms for entry and exit defects in bobbin friction stir welding. Metals , 2018, vol. 8, p. 33. DOI: 10.3390/met8010033. 23. Kalashnikova T., Chumaevskii A., Kalashnikov K., Fortuna S., Kolubaev E., Tarasov S. Microstructural analysis of friction stir butt welded Al-Mg-Sc-Zr alloy heavy gauge sheets. Metals , 2020, vol. 10 (6), p. 1–20. DOI: 10.3390/met10060806. 24. Kozlov E.V., Trishkina L.I., Popova N.A., Koneva N.A. Dislocation physics in the multilevel approach to plastic deformation. Physical Mesomechanics , 2011, vol. 14, p. 283. DOI: 10.1016/j.physme.2011.12.007. 25. Grimes R. Superplastic forming of aluminium alloys. Superplastic forming of advanced metallic materials: methods and applications . Ed. by G. Giuliano. Cambridge, Philadelphia, PA, Woodhead Publishing, 2011, pp. 247–271. Conflicts of Interest The authors declare no conflict of interest.  2021 The Authors. Published by Novosibirsk State Technical University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) .