Exploring the Impact of Friction Stir Welding Parameters on Mechanical Performance and Microstructure of AZ91C Magnesium Alloy Joints Using Taguchi Method

Document Type : Research Paper

Authors

1 Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran

2 Department of Materials Science and Engineering, Faculty of Engineering, Urmia University, Urmia, Iran

Abstract

In this study, we investigated the influence of process parameters on the mechanical properties of AZ91C magnesium alloy joints produced by friction stir welding (FSW). A Taguchi L9 orthogonal array was employed to design the experimental matrix, and the input variables were analyzed. Tensile strength and hardness values were measured for different input parameters, and their interactions were assessed through interaction plots for ultimate tensile strength (UTS) and Vickers hardness (HV). The signal-to-noise (S/N) ratios were calculated, and S/N ratio plots were generated to further understand the effects of the input parameters on the mechanical properties. Microstructural evaluations were carried out on the base metal and stir zone (SZ) of the specimens produced under various process conditions. Additionally, the appearances of the FSW samples with the minimum and maximum tensile strengths were compared.
The results revealed complex relationships between the process parameters and mechanical properties, with both main effects and interactions playing significant roles in determining the performance of the FSW joints. Notably, an optimal combination of process parameters (tool rotation speed of 1250 rpm, welding speed of 40 mm/min, and plunge depth of 0.3 mm) resulted in the highest ultimate tensile strength (UTS) and hardness (HV) values. Microstructural analysis showed that FSW significantly refined the grain size, contributing to the improvement of mechanical properties.

Keywords

References

[1]    B. Liu, J. Yang, X. Zhang, Q. Yang, J. Zhang, X. Li, Development and application of magnesium alloy parts for automotive OEMs: A review, Journal of Magnesium and Alloys, 11(1) (2023) 15-47.
[2]    D. Kumar, L. Thakur, Influence of hybrid reinforcements on the mechanical properties and morphology of AZ91 magnesium alloy composites synthesized by ultrasonic-assisted stir casting, Materials today, 35 (2023),
doi: 10.1016/j.mtcomm.2023.105937.
[3]    A. Es'haghi Oskui, N. Soltani, Experimental and numerical investigation of the effect of temperature on mixed-mode fracture behaviour of AM60 Mg alloy, Fatigue and Fracture of Engineering Materials & Structures, (2019) 1-18.
[4]    M.A. Unnikrishnan, J. Edwin Raja Dhas, K. Anton Savio Lewise, John C. Varghese, M. Ganesh, Challenges on friction stir welding of magnesium alloys in automotives, Materials Today: Proceedings, (2023), doi: 10.1016/j.matpr.2023.03.789.
[5]    A.A. Luo, Magnesium casting technology for structural applications, Journal of Magnesium and Alloys, 1(1) (2013) 2-22.
[6]    K.U. Kainer, Magnesium Alloys and their Applications, Deutsche Gesell schaft für Materialkunde, (2000).
[7]    R.S. Mishra, Z.Y. Ma, Friction stir welding and processing. Materials Science and Engineering: R: Reports, 50(1-2) (2005) 1-78.
[8]    L.Liu, Welding and joining of magnesium alloys, Welding and Other Joining Technologies, (2010).
[9]    P. Cavaliere, F. Panella, A. Squillace, Effect of welding parameters on mechanical and microstructural properties of AA6082 joints produced by friction stir welding, Journal of Materials Processing Technology, 180(1-3) (2006) 263-270.
[10]    F. Chai, D.T. Zhang, Y.J. Li, Z.Q. Wu, Influence of welding parameters on microstructure and mechanical properties of friction stir welded Mg-Zn-Y-Zr alloy, Materials & Design, 46 (2013) 519-524.
[11]    S. Rouhi, M. Shamanian, M. Esmailzadeh, Effects of welding environment on microstructure and mechanical properties of friction stir welded AZ91C magnesium alloy, Materials & Design, 35 (2012) 686-691.
[12]    S. Malarvizhi, V. Balasubramanian, Influence of tool pin profile on microstructure and tensile properties of friction stir welded dissimilar aluminum alloys, Materials & Design, 32(6) (2011) 3613-3623.
[13]    H. Sharankumar, V.J. Badheka, Effect of process parameters on tensile strength of friction stir welded aluminium matrix composite, Procedia Engineering, 97 (2015) 1837-1846.
[14]    J. Singh, A. Chauhan, Optimization of friction stir welding parameters for dissimilar aluminum alloys using Taguchi technique, Procedia Engineering, 97 (2015) 2055-2062.
[15]    D. Devaiah, K. Kishore, P. Laxminarayana, Optimal FSW process parameters for dissimilar aluminium alloys (AL 5083 and AL 6061) Using Taguchi Technique, Materials Today: Proceedings, 5 (2018) 4607–4614.
[16]    R.S. Mishra, M.W. Mahoney, Friction Stir Welding and Processing, ASM International, (2007).
[17]    K. Ranjit Roy, A Primer on the Taguchi Method, Society of Manufacturing Engineers (2010).
[18]    P. Zolghadr, M. Akbari, P. Asadi, Formation of thermo-mechanically affected zone in friction stir welding, Materials Research Express, (2019), doi: 10.1088/2053-1591/ab1d25.
[19]    M. Akbari, P. Asadi, Dissimilar friction stir lap welding of aluminum to brass: Modeling of material mixing using coupled Eulerian–Lagrangian method with experimental verifications, Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications, 234(8) (2020) 1117-1128, doi:10.1177/1464420720922560.
[20]    L. ížek, M. Gregera, L. Pawlicaa, L.A. Dobrzaskib, T. Taski, Study of selected properties of magnesium alloy AZ91 after heat treatment and forming, Journal of Materials Processing Technology 157-158 (2003) 466-471.
[21]    G. Nussbaum, P. Bridot, T.J. Warner, J. Charbonnier, G. Regazzon, In magnesium alloys and their applications, B.L. Mordike and Hehmann, eds., DMG Informationsgesellshaft, Oberursel, (1992) 351-358.
Iranian Journal of Materials Forming
Volume 10, Issue 3
July 2023
Pages 4-14

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