PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 43 (2023) 166–171

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract A new route of s vere plastic ef r ation – the complex shearing of ex ruded tube (CSET) technique – was proposed r ce tly. In this route, tube is produc d from a rod via extrusion combine with two pas es of an equal cha nel angular pressing like processing a d with mandrel rotation. In the present paper, we describ and discuss the changes in the microstruct re of an aluminum single crystal processed by CSET with respect to grain refinement, orientation changes and dislocation distribution. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 1. Introduction Sev re plastic deformation (SPD) is a way to produce materials with improv d me ical properties via substantial grain refinement (Valiev et al., 2000). Besides the pioneer techniques such as equal channel angular pressing (ECAP) and high‐pressure t rsion (HPT) (Valiev et al., 2000), new ways did later appear which combine th basic techniques to produce more complex forms than rods and discs. Among these combined techniques, those resulting in t production of tubes are very important. At first, the tubular samples with special filling were applied to preserve th shape during and after processing by ECAP (Nagas khar 2006). Later, the pressing of the tube thr ugh free spac betwe n the form and the ce tral ma drel was applied. In this respect, Zangia adi et al. (2001) introduced the tube channel pressing (TCP) technique consisting in passing the material through a bottleneck region. Similarly, Faraji et Abstract A new route of severe plastic deformation – the complex shearing of extruded tube (CSET) technique – was proposed recently. In this route, a tube is produced from a rod via extrusion combined with two passes of an equal channel angular pressing like processing and with mandrel rotation. In the present paper, we describe and discuss the changes in the microstructure of an aluminum single crystal processed by CSET with respect to grain refinement, orientation changes and dislocation distribution. Keywords: tube forming; complex shearing of extruded tube; single crystal; aluminum; microstructure. Keywords: tube forming; complex shearing of extruded tube; single crystal; aluminum; microstructure. 1. Introduction Severe plastic deformation (SPD) is a way to produce materials with improved mechanical properties via substantial grain refinement (Valiev et al., 2000). Besides the pioneer techniques such as equal channel angular pressing (ECAP) and high‐pressure torsion (HPT) (Valiev et al., 2000), new ways did later appear which combine the basic techniques to produce more complex forms than rods and discs. Among these combined techniques, those resulting in the production of tubes are very important. At first, the tubular samples with special filling were applied to preserve the shape during and after processing by ECAP (Nagasekhar 2006). Later, the pressing of the tube through free space between the form and the central mandrel was applied. In this respect, Zangiabadi et al. (2001) introduced the tube channel pressing (TCP) technique consisting in passing the material through a bottleneck region. Similarly, Faraji et 10th International Conference on Materials Structure and Micromechanics of Fracture Complex severe plastic deformation of aluminum single crystal Orsolya Molnárová a , Andrea Školáková a , Stanislav Habr a , Jaroslav Čapek a , Zdeněk Weiss a , Přemysl Málek b , Pavel Lejček a * 10th International Conference on Materials Structure and Micromechanics of Fracture Complex severe plastic deformation of aluminum single crystal Orsolya Molnárová a , Andre Školáková a , Stanislav Habr a , Jaroslav Čapek a , Zdeněk Weiss a , Přemysl Málek b , Pavel Lejček a * a Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic b Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5,121 16 Prague, Czech Republic a Ins itute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic b Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5,121 16 Prague, Czech Republic

* Corresponding author. Tel.: -420-266-052-167; fax: +420-286-890-527. E-mail address: lejcekp@fzu.cz * Correspon ing author. Tel.: -420-266-052-167; fax: +420-286-890-527. E-mail address: lejcekp@fzu.cz

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.253