LM6 Alüminyum Alaşımlarında Zr’nin Etkisi

Bu çalışmada, konvansiyonel döküm yöntemiyle üretilen ve alaşımların mikroyapı ve mekanik özellikleri üzerine farklı miktarlarda Zr (% 0,05 ve 0,15) içeren LM6 alaşımları üzerindeki Zr miktarının etkisi incelenmiştir. Ek olarak, üretilen alaşımlar 200-250 ppm Strontium (Sr) ile modifiye edilmiştir. Mikroyapı analizlerinde optik mikroskop (OM) ve taramalı elektron mikroskobu (SEM / EDS analizi) kullanılmıştır. Farklı miktarlarda zirkonyum ilave edilen ve Sr ile modifiye edilmiş alaşımların sertlik ve gerilme testleri yapılmıştır. Yapılan çalışmalar sonucunda, optik mikroskop (OM) ve taramalı elektron mikroskobu (SEM) görüntülerinde, Al-Si-Fe fazının morfolojisinin Zr ilavesine bağlı olarak değişmiştir. En yüksek yüzde uzama Al12Si alaşımından elde edilirken, stronsiyum tarafından modifiye edilen LM6 alaşımından en yüksek sertlik ve maksimum gerilme dayanımı elde edilmiştir. En yüksek akma dayanımı 0.05 Zr ile alaşımlı olan LM6 alaşımından elde edilmiştir.. Eklenen Zr miktarının, Al12Si alaşımının maksimum çekme dayanımında önemli bir fark göstermediği bulunmuştur.

Anahtar Kelimeler:

Al-Si alaşımları, modikasyon, alaşımlama, mikroyapı

The Effect of Zr on LM6 Aluminum Alloy

In this study, the effect of Zr amount on LM6 alloys which were produced by conventional casting method and contained different amounts of Zr (0.05% and 0.15) on the microstructure and mechanical properties of the alloys was investigated. In addition, produced alloys were modified with 200-250 ppm Strontium (Sr). optic microscope (OM) and scanning electron microscopy (SEM / EDS analysis) were used for microstructure analysis. The hardness and tensile tests of the alloys which were modified by Sr and alloyed with different amounts of zirconium were performed. As a result of the studies that were done, it was determined in the images of optical microscope (OM) and scanning electron microscope (SEM) that the morphology of Al-Si-Fe phase changed depending on the addition of Zr, and that Al-Si-Fe intermetalics having different amounts of Zr composed. While the highest level of percent elongation was obtained from the Al12Si alloy, the highest level of hardness and maximum tensile strength were obtained from the LM6 alloy modified by strontium. The highest level of yield strength was obtained from LM6 alloy which was alloyed with 0.05 Zr. It was found that the amount of added Zr did not show a significant difference at the maximum tensile strength level of Al12Si alloy.

Keywords:

Al-Si alloys, modification, alloyed, microstructure,

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Referans1 Davis, J.R., “Alloying, understanding the basics”, ASM International, Materials Park, OH 44073–0002, 2001.
Referans2 Sigworth, G.K., Alcoa, P.M., “Modification of aluminum-silicon alloys” Int J Metalcast 49:90–104, 2008.
Referans3 Dwivedi, D.K., “Influence of modifier and grain refiner on solidification behaviour and mechanical properties of cast Al-Si base alloy”, Journal of the Institution of Engineers (India), Part MM: Metallurgy and Material Science Division, 83, 46-49, 2002.
Referans4 Miller, W.S., Zhuang, L., Bottema, J., Wittebrood, A.J., De Smet, P., Haszler, A., Vieregge, A., “Recent development in aluminium alloys for the automotive industry, “Materials Science and Engineering A”, 280, 37–49, 2000.
Referans5 Jiang,B., Ji, Z., Hu, M., Xu, H., Xu, S., “A novel modifier on eutectic Si and mechanical properties of Al-Si alloy”, Materials Letters 239, 13–16, 2019.
Referans6 Hatch, J.E., “Aluminum properties and physical metallurgy”, ASM, Metals Park, OH, pp 1–104, 200–241, 320–350, 1984.
Referans7 Samuel, A.M., Doty, H.W., Valtierra, S., Samuel, F.H., “Effect of grain refining and Sr-modification interactions on the impact toughness of Al–Si–Mg cast alloys”, Materials and Design 56, 264–273, 2014.
Referans8 Wang, E., Gao, T., Nie, J., Liu. X., "Grain refinement limit and mechanical properties of 6063 alloy inoculated by Al–Ti–C (B) master alloys”, Journal of Alloys and Compounds, 594, 7–11, 2014.
Referans9 Haque, M.M., “”, Journal of Materials Processing Technology 55 (1995) 193-198.
Referans10 Baradarani, B., Raiszadeh, R., “”, Materials and Design 32, 935–940, 2011.
Referans11 Liu, W., Xiao, W., Xu, C., Liu, M., Ma, C., “Synergistic effects of Gd and Zr on grain refinement and eutectic Si modification of Al-Si cast alloy”, Materials Science & Engineering A 693, 93–100, 2017.
Referans12 Tunçay T. and Özyürek. D., “The Effect on microstructure and mechanical properties of filtration in Al-Si-Mg alloys, Journal of Faculty of Engineering and Architecture of Gazi University, 29 (2), 271-279, 2014.
Referans13 Khalifa, W., Samuel, F.H., Gruzleski, J.E., “Iron intermetallic phases in the Al corner of the Al-Si-Fe system”, Metallurgical and Materials Transactions A, 34A, 807,825, 2003.
Referans14 Khalifa, W., Samuel, A.M., Samuel, F.H., Doty, H.W., Valtierra, S., “Metallographic observations of b-AlFeSi phase and its role in porosity formation in Al–7%Si alloys", International Journal of Cast Metals Research, 19,156-166, 2006.
Referans15 Cao, X. Campbell, J., “Morphology of β-Al5FeSi phase in Al-Si cast alloys”, Materials Transactions 47, 1303-1312, 2006.
Referans16 Dinnis, C.M., Taylor, J.A., Dahle, A.K., “As-cast morphology of iron-intermetallics in Al–Si foundry alloys”, Scripta Materialia 53 (2005) 955–958.
Referans17 Elhadari, H.A., Patel, H.A., Chen, D.L., Kasprzak, W., “Tensile and fatigue properties of a cast aluminum alloy with Ti, Zr and V additions”, Materials Science and Engineering: A, Volume 528, Issue 28, 8128-8138, 2011.
Referans18 Sepehrband, P., Mahmudi, R., Khomamizadeh. F., “Effect of Zr addition on the aging behavior of A319 aluminum cast alloy”, Scripta Materialia 52, 253–257, 2005.
Referans19 Kasprzak, W., Emadi, D., Sahoo, M., Aniolek, M., “Development of aluminium alloys for high temperature applications in diesel engines”, Mater. Sci. Forum,618: 595–600, 2009.
Referans20 Tunçay, T., Bayoğlu, S., The effect of ıron content on microstructure and mechanical properties of A356 cast alloy”, Metallurgical and Materials Transactions B, 48, 2, 794-804, 2017.