PSI - Issue 33

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 33 (2021) 887–895

© 2021 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 responsibility of the scientific committee of the IGF ExCo © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo This work is primarily aimed at sh wing how FIB function lities can be expanded and iscussing the challenges that may be encou tered by doing that. Ther fore, a pr limi ary FIB-as is ed methodology for cold bonding of AA1070 and AA6082 aluminium lloys at the microscale is presented. In situ cross-sectioning of the weld nd prop r scanning-electron im ging have revealed that, under certa n pressure conditions, xide-free alumin um interfaces re able to be joined at room temp rature even at the microscale. Experimental technique improvement and testing of the obtained joints are the next steps needed in this research. © 2021 The Authors. Published by ELSEVIER B.V. This is an open acc ss article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo IGF26 - 26th International Conference on Fracture and Structural Integrity Preliminary in-situ study of FIB-assisted method for aluminium solid-state welding at the microscale Ambra Celotto a *, Øystein Grong a,b , Randi Holmestad c , Jørgen A. Sørhaug c , Jan Torgersen a , Per Erik Vullum c , Filippo Berto a a Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2B, 7491 Trondheim, Norway b HyBond AS, NAPIC, Richard Birkelands vei 2B, 7491 Trondheim, Norway c Department of Physics, , Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway Abstract In situ studies allow real time monitoring and deep comprehension of phenomena. This approach has been applied to the current research for the development of a novel solid-state welding technique at the microscale. The downscaling of the process has been inspired by Cold Pressure Welding (CPW) working principles and it has been carried out by a tailored setup of a high-resolution Focused Ion Beam – Scanning Electron Microscope (FIB-SEM). This work is primarily aimed at showing how FIB functionalities can be expanded and discussing the challenges that may be encountered by doing that. Therefore, a preliminary FIB-assisted methodology for cold bonding of AA1070 and AA6082 aluminium alloys at the microscale is presented. In situ cross-sectioning of the weld and proper scanning-electron imaging have revealed that, under certain pressure conditions, oxide-free aluminium interfaces are able to be joined at room temperature even at the microscale. Experimental technique improvement and testing of the obtained joints are the next steps needed in this research. IGF26 - 26th International Conference on Fracture and Structural Integrity Preliminary in-situ study of FIB-assisted method for aluminium solid-state welding at the microscale Ambra Celotto a *, Øystein Grong a,b , Randi Holmestad c , Jørgen A. Sørhaug c , Jan Torgersen a , Per Erik Vullum c , Filippo Berto a a Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2B, 7491 Trondh im, Norway b HyBond AS, NAPIC, Richard Birk l s vei 2B, 7491 Trondhe m, Norway c Department of Physics, , Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway Abstract In situ studies allow real time mo itoring and de p compreh nsion of pheno ena. This approach has been applied to the curr nt re ea ch for the dev lopment of a novel solid-state welding t ch ique t th mi roscale. The downscaling of the process has bee inspir by Cold Pressure Welding (CPW) w rking principles and it has been carried out by a tailored setup of a high-resolution Focused Ion Bea – Sc nning Electron Microscope (FIB-SEM). Keywords: microjoining; solid-state welding; cold pressure welding; Focused Ion Beam; electron microscopy; aluminium alloys. Keywords: microjoining; solid-state welding; cold pressure welding; Focused Ion Beam; electron microscopy; aluminium alloys.

* Corresponding author. Tel.: +39-347-060-3897. E-mail address: ambra.celotto@ntnu.no * Correspon ing autho . T .: +39-347-060-3897. E-mail address: ambra.celotto@ntnu.no

2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open acc ss article und r the CC BY-NC-ND licens (https:// reativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 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 responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.099