THE EFFECTS OF WELDING PRESSURE AND REINFORCEMENT RATIO ON WELDING STRENGTH IN DIFFUSION-BONDED AlMg3/SiCp COMPOSITES

Year 2020, Volume: 10 Issue: 1, 75 - 85, 01.06.2020

Nilhan Ürkmez Rifat Yakut , Engin Alp

Abstract

In this study, using the diffusion welding method, welded joints were created with AlMg3/SiCp composite materials, and the mechanical strengths of these joints were examined. The AlMg3/SiCp composite specimens were cut out of plates produced directly with semi-solid stir-squeeze casting and contained 10% SiCp and 20% SiCp reinforcement. To examine the effects of reinforcement ratios on joint strength, specimen couples with the same and different reinforcement ratios were created. To examine the effects of different welding pressures on joint strength, by keeping the welding temperature constant at 580°C, welding was achieved under 3 different pressures as 1.5 MPa, 2.5 MPa and 3.5 MPa. By determining the mechanical strengths of the welded joints that were formed by shear test, the effects of reinforcement ratios and welding pressures on joint strength were investigated. As a result of the shear tests applied on the welded specimens, in the specimens that were diffusion-welded, welding quality decreased based on increasing reinforcement ratios, but as the amount of pressure and application duration increased, joint strength increased. As the SiC ratio increased in the joint zones, diffusion became difficult, and weak joints were occurred. The microscopic structure of the joint zone was examined by using optical microscopy and scanning electron microscopy (SEM) .It was seen that diffusion welding could be successfully performed in bonding SiCp-reinforced aluminum composites if the suitable welding pressure and duration are selected.

Keywords

Diffusion Welding, Aluminum, SiC, Metal Matrix Composites, Shear Test

References

• Garg, P., Jamwal, A., Kumar, D., Sadasivuni, K. K., Hussain, C. M., Gupta, P. (2019). Advance research progresses in aluminium matrixcomposites: Manufacturing & applications, Journal of Materials Research and Technology, 8 (5), 4924–4939.
• Rosso, M. (2006). Ceramic and metal matrix composites: Routes and properties, Journal of Materials Processing Technology, 175 (1-3), 364–375.
• Kaczmar, J. W., Pietrzak, K., Wlosinski, W. (2000). The production and application of metal matrix composite materials, Journal of Materials Processing Technology, 106 (2000), 58–67.
• Ellis, M. B. D. (2007). Joining of Al-based metal matrix composites - A review, Materials and Manufacturing Processes 11 (1), 45–66.
• Arık, H., Aydın, M., Kurt, A., Türker M. (2005). Weldability of Al4C3-Al composites via diffusion welding tecnique, Materials and Design, 26 (6), 555-560.
• Uluköy, A., Onar V., Kaplan, Y. (2015). The microstructure and hardness properties analysis of welded aluminum matrix material reinforced with sic using different currents and forms of welding” Pamukkale University Journal of Engineering Sciences, 21 (8), 365-370.
• Karakoç, H., Çıtak, R., (2017). Study on weldability of b4c reinforced aluminium composite materials with TIG welding, El-Cezerî Journal of Science and Engineering, 4 (3), 584-592.
• Storjohann, D., Barabash, O.M., Babu, S.S., David, S.A., Sklad, P.S., Bloom, E.E., (2005). Fusion and friction stir welding of aluminum-metal-matrix composites, Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 36 (11), 3237–3247.
• Lean, P. P., Gil, L., Urena, A., (2003). Dissimilar welds between unreinforced AA6082 and AA6092/SiC/25p composite by pulsed-MIG arc welding using unreinforced filler alloys (Al-5Mg and Al-5Si), Journal of Materials Processing Technology 143–144 (2003), 846–850.
• Aydın, M., Diffusion welding of SiC particle reinforced 7075 aluminium alloy matrix composites, Gazi University, Institute of Science and Technology, Ph.D. Thesis, Ankara, 2003.
• Buytoz, S., The investigation of weldability of al matrix - Al2O3 reinforced composite materials with solid state bonding methods, Fırat University, Institute of Science and Technology, Master of Science Thesis, Elazığ, 1999.
• Çalıgülü, U., The investigation of joinability of with hot pressing manufactured AlSiMg-SiCp reinforced composites, Fırat University, Institute of Science and Technology, Master of Science Thesis, Elazığ, (2005).
• Çelik, S., An investigation of diffusion welding parameters for pure aluminum and copper in inert gas, Balıkesir University, Institute of Science and Technology, Ph.D. Thesis, Balıkesir, 1996.
• Dikbaş, H., The investigation of bondability of Ni-Ti alloys by powder metallurgy method with the diffusion bonding, Fırat University, Institute of Science and Technology, Master of Science Thesis, Elazığ, (2005).
• Erden, İ. O., Investigation of weldability of Al-Si3n4 composite materials by diffusion welding, Gazi University, Institute of Science and Technology, Master of Science Thesis, Ankara, 2005.
• Mollaoğlu, H., Diffusion bonding of SiC partilucate reinforced Al metal matrix composites, Yildiz Technical University, Institute of Science and Technology, Master of Science Thesis, İstanbul, 2004.
• Çelik, Y. H., Kılıçkap, E., Yenigün, B. (2018). The effect of contact pressure and B4C ratio on hardness and wear behaviours in Al-matrix composites produced by PM method, Science and Eng. J of Fırat Univ., 30 (1), 33-40.
• Yakut R., Ürkmez Taşkın, N. (2019). Production of AA7075/B4C composite materials by the semi-solid stirring method, European Journal of Technique (EJT), 9 (2), 230–240.
• Adin, H., Seven, B., Çakar, F., Yıldırım, H., Ataş, İ. (2017 ). Experimental determination of the mechanical properties of composite materials produced with particle reinforced adhesives, European Journal of Technique (EJT), 7 (2), 158–164.
• Yakut R., Ürkmez Taşkın, N. (2018). Production of AA7075 / B4C / SiC hybrid composite materials by semi-solid stirring method, 1st Internatıonal Engıneerıng And Technology Symposıum (1st Iets) 03–05 May, Batman / Turkey.
• Ürkmez, N., Production of AlMg3/SiCp composites and investigations of variations in mechanical properties, Yildiz Technical University, Instıtute of Scıence And Technology, Ph.D. Thesis, İstanbul, 2004.
• Espacenet Bibliographic data: Publication Number:WO2015094139
• Alp, E., Investigation of weldability of AlMg3/SiCp composites, Trakya University, Institute of Science and Technology, Master of Science Thesis, Edirne, 2008.
• Özdemir, U., Microstructural and mechanical characterization of diffusion bonded TiAl and Ti6Al4V alloys, Mustafa Kemal University, Institute of Science and Technology, Master of Science Thesis, Hatay, 2003.