PSI - Issue 69

Muhammad Asim et al. / Procedia Structural Integrity 69 (2025) 41–46

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significant surface remelting and micro-plastic deformation [16]. In this work, low laser power was used during the F-LSP treatment to enhance the functional performance of the SMA. Such low power level was selected in this work to minimize surface damage during LSP while still introducing the advantageous effects associated with this novel processing technique.

Figure 4 (a) Surface Roughness Profile without F-LSP (b) Surface Roughness Profile after F-LSP

4. Conclusion The utilization of Femtosecond laser shock peening to enhance the functional fatigue properties of TiNbZrSn alloy was presented in this study. The F-LSP process was conducted under the confining medium of de-ionized water. The SE mechanical properties exhibited enhanced recovery of SE strains following F-LSP treatment with optimized laser processing conditions. Moreover, samples treated with F-LSP showed better functional response when subjected to cyclic loading compared to the unprocessed conditions (considering 25 cycles only). The results showed that F-LSP promoted the alloy’s hindrance to the accumulation of irrecoverable strains. The surface roughness results also showed that optimized F-LSP processing conditions under confining medium led to minimal surface damage. Overall, this study concluded that the functional fatigue properties of TiNbZrSn alloy were improved by F-LSP. References J. Mohd Jani, M. Leary, A. Subic, and M. A. Gibson, “A review of shape memory alloy research, applications and opportunities,” Apr. 01, 2014, Elsevier Ltd. doi: 10.1016/j.matdes.2013.11.084. W. Abuzaid and H. Sehitoglu, “Functional fatigue of Ni50.3Ti25Hf24.7 – Heterogeneities and evolution of local transformation strains,” Materials Science and Engineering: A, vol. 696, pp. 482–492, Jun. 2017, doi: 10.1016/j.msea.2017.04.097. M. Fabrizio and M. Pecoraro, “Phase transitions and thermodynamics for the shape memory alloy AuZn,” Meccanica, vol. 48, no. 7, pp. 1695– 1700, Sep. 2013, doi: 10.1007/s11012-013-9701-3. E. Denkhaus and K. Salnikow, “Nickel essentiality, toxicity, and carcinogenicity,” 2002. [Online]. Available: www.elsevier.com/locate/critrevonc W. Abuzaid et al., “FeMnNiAl Iron-Based Shape Memory Alloy: Promises and Challenges,” Shape Memory and Superelasticity, vol. 5, no. 3, pp. 263–277, Sep. 2019, doi: 10.1007/s40830-019-00230-9. F. Auricchio, E. Boatti, M. Conti, and S. Marconi, “SMA biomedical applications,” in Shape Memory Alloy Engineering: For Aerospace, Structural, and Biomedical Applications, Elsevier, 2021, pp. 627–658. doi: 10.1016/B978-0-12-819264-1.00019-4. X. Tang, T. Ahmed, and H. J. Rack, “Phase transformations in Ti-Nb-Ta and Ti-Nb-Ta-Zr alloys.” Y. Cui, Y. Li, K. Luo, and H. Xu, “Microstructure and shape memory effect of Ti-20Zr-10Nb alloy,” Materials Science and Engineering: A, vol. 527, no. 3, pp. 652–656, Jan. 2010, doi: 10.1016/j.msea.2009.08.063. K. M. Kim, H. Y. Kim, and S. Miyazaki, “Effect of Zr content on phase stability, deformation behavior, and young’s modulus in Ti-Nb-Zr alloys,” Materials, vol. 13, no. 2, Jan. 2020, doi: 10.3390/ma13020476. S. Miyazaki and H. Y. Kim, “Basic characteristics of titanium–nickel (Ti–Ni)-based and titanium–niobium (Ti–Nb)-based alloys,” in Shape Memory and Superelastic Alloys, Elsevier, 2011, pp. 15–42. doi: 10.1533/9780857092625.1.15.