PSI - Issue 68

V. Milani et al. / Procedia Structural Integrity 68 (2025) 1181–1187 V. Milani, G. Angella, G. Timelli/ Structural Integrity Procedia 00 (2025) 000–000

1187

7

4. Conclusions The present study successfully employed Weibull’s statistical approach to assess the efficiency of different fluxes on a secondary AlSi9Cu3(Fe) alloy. Fluxes allow to obtain higher values of Weibull moduli in the two-parameter Weibull analysis, suggesting improved reliability. The three-parameter Weibull analysis shows that the threshold parameter increases with the use of flux, raising the value of elongation below which no sample is expected to fail. This improvement contributes to the safety of castings. High porosity levels in untreated alloy led to wider Weibull distribution, whereas harmful β-Fe phases, encountered in samples processed at 720 °C, shift the distributions to lower ductility. For improved reliability and safety of castings, flux treatment and melt-temperature monitoring are therefore necessary. Acknowledgements Financed by the European Union – NextGenerationEU (National Sustainable Mobility Center CN00000023, Italian Ministry of University and Research Decree n.1033 -17/06/2022, Spoke 11- Innovative Materials & Lightweighting). The opinions expressed are those of the authors only and should not be considered as representative of the European Union or the European Commission’s official position. Neither the European Union nor the European Commission can be held responsible for them. 16748:2014, CEN/TR. (2014). Aluminium and aluminium alloys - Mechanical potential of Al-Si alloys for high pressure, low pressure and gravity die casting. Eisaabadi B., G., Davami, P., Kim, S., & Tiryakioğlu, M. (2013). The Effect of Melt Quality and Filtering on the Weibull Distributions of Tensile Properties in Al-7%Si-Mg Alloy Castings. Materials Science and Engineering A, 579, 64-70. El-Sayed, M., Essa, K., & Hassanin, H. (2022). Influence of Bifilm Defects Generated during Mould Filling on the Tensile Properties of Al-Si Mg Cast Alloys. Metals, 12(160). Gallo, R. (2017). Molten Aluminum Cleanliness: 25 Years in Review - The Technological Advancements, and the Foundry Practices. Division 2 Silver Anniversary Paper - American Foundry Society. Ghanaatian, M., & Raiszadeh, R. (2022). Effect of Different Methods for Removing Bifilm Defects from A356 Aluminum Alloy. Metallurgical and Materials Transactions B, 53B, 503-511. Gyarmati, G., Fegyverneki, G., Molnar, D., & Tokár, M. (2018). The Melt Cleaning Efficiency of Different Fluxes and Their Effect on the Eutectic Modification Level of AlSi7MgCu Alloy. 58th International Foundry Conference . Portorož, Slovenia. Haghayeghi, R., Scampone, G., Gürsoy, Ö., & Timelli, G. (2022). Effects of Casting Temperature and Iron Content on the Microstructure of Hypoeutectic A380 Aluminium Alloy. Light Metals 2022, 790-797. Liu, L., & Samuel, F. (1998). Effect of inclusions on the tensile properties of Al-7% Si-0.35% Mg (A356.2) aluminium casting alloy. Journal of Materials Science, 33, 2269-2281. Milani, V., & Timelli, G. (2023). Solid Salt Fluxes for Molten Aluminum Processing - A Review. Metals, 13(5), 832. Timelli, G. (2018). High-Pressure Die-Cast AlSi9Cu3(Fe) Alloys: Models for Casting Defects and Mechanical Properties. Encyclopedia of Aluminum and Its Alloys, 1162 - 1172. Timelli, G., & Bonollo, F. (2008). Quality mapping of aluminium alloy diecastings. Metallurgical Science and Technology, 26(1). Tiryakioglu, M., & Campbell, J. (2010). Weibull Analysis of Mechanical Data for Castings: A Guide to the Interpretation of Probability Plots. Metallurgical and Materials Transactions A, 41A, 3129-3129. Zahedi, M., Emamy, M., Razaghian, A., Mahta, M., Campbell, J., & Tiryakioğlu, M. (2007). The Effect of Fe-Rich Intermetallics on the Weibull Distribution of Tensile Properties in a Cast Al-5%Si-3%Cu-1%Fe-0.3%Mg Alloy. Metallurgical and Materials Transactions A, 38, 659-670. References