PSI - Issue 69

C.A. Biffi et al. / Procedia Structural Integrity 69 (2025) 47– 52

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Finally, it should be underlined that the laser welding process did not largely affect the transformation temperatures of the NiTiHf alloy, opening to the possibility of effectively employing this technique to join high-temperature, shape memory alloys. Acknowledgements The authors would like to acknowledge Enrico Bassani and Nicola Bennato from CNR ICMATE for their assistance in the performed experiments. This study was carried out within the MICS (Made in Italy – Circular and Sustainable) Extended Partnership and received funding from the European Union Next-Generation EU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR). The authors would like to thank Optoprim for the longstanding collaboration. The technical support of nLight and Raylase are gratefully acknowledged. References [1] R. Noebe, S.A. Padula, NiTi-Based High-Temperature Shape-Memory Alloys: Properties, Prospects, and Potential Applications, in Advanced Structural Materials: Properties, Design Optimization, and Applications, S.T. Soboyejo WO Editor. 2007, Taylor & Francis Group: NW. [2] J. Ma, I. Karaman, R.D. Noebe, Int. Mater. Rev. 2010; 55- 5: 257. [3] O. Benafan, G. S. Bigelow, A. Garg, R. D. Noebe, D. J. Gaydosh, R. B. Rogers, Processing and Scalability of NiTiHf High - Temperature Shape Memory Alloys, Shape Memory and Superelasticity, 7 (2021) 109–165 [4] Y. Yamabe-Mitarai, R. Arockiakumar, A. Wadood, K.S. Suresh, T. Kitashima, T. Hara, M. Shimojo, W. Tasaki, M. Takahashi, S. Takahashi, H. Hosod, Ti(Pt, Pd, Au) based high temperature shape memory alloys, International Conference on Martensitic Transformations, ICOMAT-2014, Materials Today: Proceedings 2S ( 2015 ) 517 – 522 [5] O. Karakoc, K.C. Atli, O. Benafan, R.D. Noebe, I. Karaman, Actuation fatigue performance of NiTiZr and comparison to NiTiHf high temperature shape memory alloys, Materials Science and Engineering: A, 829 (2022) 142 154. [6] Biffi CA, Fiocchi J, Coduri M, Tuissi A. Effect of al addition on martensitic transformation stability and microstructural and mechanical properties of cuzr based shape memory alloys. Metals (Basel). 2021;11(7). [7] N. Babacan, M. Bilal, C. Hayrettin, J. Liu, O. Benafan, I. Karaman, Effects of cold and warm rolling on the shape memory response of Ni50Ti30Hf20 high-temperature shape memory alloy, Acta Materialia 157 (2018) 228 – 244. [8] C.A. Biffi, A. Tuissi, Hot Workability of Cu-Zr based Shape Memory Alloys for Potential High Temperature Applications, Journal of Materials Engineering and Performances, Volume 23, Issue 7(2014), Page 2379-2384. [9] J.P. Oliveira, R.M. Miranda, F.M. Braz Fernandes, Welding and Joining of NiTi Shape Memory Alloys: A Review, Progress in Materials Science 88 (2017) 412-466, https://doi.org/10.1016/j.pmatsci.2017.04.008. [10] Mehrshad Mehrpouya, Annamaria Gisario, Mohammad Elahinia, Laser welding of NiTi shape memory alloy: A review, Journal of Manufacturing Processes 31 (2018) 162-186. https://doi.org/10.1016/j.jmapro.2017.11.011. [11] Dickey, F. M. (2003). Laser beam shaping. Optics and photonics news, 14(4), 30-35. [12] Francesco Galbusera, Leonardo Caprio, Barbara Previtali, Ali Gökhan Demir, The influence of novel beam shapes on melt pool shape and mechanical properties of LPBF produced Al-alloy, Journal of Manufacturing Processes 85 (2023) 1024-1036. https://doi.org/10.1016/j.jmapro.2022.12.007. [13] Caprio, L.; Previtali, B.; Demir, A. G., Effect of in-source beam shaping and laser beam oscillation on the electromechanical properties of Ni plated steel joints for e-vehicle battery manufacturing, J. Laser Appl. 1 November 2023; 35 (4): 042030, https://doi.org/10.2351/7.0001151. [14] Y Mi, F Sikström, M Nilsen, S Joshi, P Guglielmi, G Palumbo and A Ancona, Impact of laser beam shaping on weld pool and seam geometry in butt-joint welding with filler wire, IOP Conference Series: Materials Science and Engineering 1296 012026, 10.1088/1757-899X/1296/1/012026. [15] Francesco Galbusera, Leonardo Caprio, Barbara Previtali, Ali Gökhan Demir, Analytical modeling and characterization of ring beam profiles for high-power lasers used in industrial manufacturing, Journal of Manufacturing Processes 117 (2024) 387-404. https://doi.org/10.1016/j.jmapro.2024.02.069.