Influence of Casting Route on the Microstructure and Mechanical Behavior of A360 Aluminum Alloy: A Process–Structure–Property Correlation

Yıl 2025, Cilt: 8 Sayı: 2, 118 - 126, 31.12.2025

Eda Ergün Songül , Derya Dispinar

https://doi.org/10.55581/ejeas.1820954

https://izlik.org/JA87UE26EF

Öz

This study comprehensively examines the effect of casting route—sand versus permanent mold—on the microstructural evolution and mechanical performance of A360 aluminum alloy produced under identical alloy composition. The objective was to elucidate how differences in cooling rate and solidification kinetics affect dendritic morphology, eutectic silicon distribution, and the resulting property–structure correlation. The alloy was melted at 730 ± 5 °C under an argon-protected atmosphere and cast using silica–bentonite sand and preheated steel molds (200 °C) under gravity conditions to ensure reproducibility. Optical microscopy revealed that the permanent mold route generated a highly refined α-Al dendritic structure with reduced secondary dendrite arm spacing (SDAS) and a uniformly dispersed eutectic Si network, whereas the sand cast alloy exhibited coarse dendrites and irregular Si clusters. These microstructural distinctions led to clear performance differences: the permanent mold alloy achieved approximately 18 % higher Brinell hardness and 10–15 % higher tensile strength while maintaining comparable elongation. Furthermore, its Charpy impact energy increased from 4.81 J to 5.07 J, reflecting superior energy absorption and fracture toughness due to finer and more homogeneous solidification morphology. The findings emphasize that controlling the casting process—specifically through enhanced cooling rate—can significantly strengthen A360 alloy without any chemical modification or heat treatment. This study provides fundamental insight into the process–structure–property relationship and offers a practical reference for sustainable design and manufacturing of high-integrity aluminum components for automotive and aerospace applications.

Anahtar Kelimeler

A360 aluminum alloy , hardness , impact energy , microstructure , permanent mold casting , sand mold casting , tensile strength

Kalıp Tipinin A360 Alüminyum Alaşımının Mikroyapı ve Mekanik Davranışı Üzerindeki Etkisi: Süreç–Yapı–Özellik İlişkisi

https://izlik.org/JA87UE26EF

Öz

Bu çalışma, kimyasal bileşimi aynı tutulan A360 alüminyum alaşımında, farklı döküm yöntemlerinin—kum kalıba ve kokil kalıba döküm—mikroyapısal evrim ve mekanik özellikler üzerindeki etkisini kapsamlı biçimde incelemiştir. Çalışmanın temel amacı, soğuma hızı ve katılaşma kinetiğindeki farklılıkların dendrit morfolojisi, ötektik silisyum dağılımı ve buna bağlı olarak oluşan yapı–özellik ilişkisi üzerindeki etkilerini ortaya koymaktır. Alaşım, 730 ± 5 °C’de argon atmosferi altında ergitilmiş ve karşılaştırılabilir deney koşullarını sağlamak amacıyla silika–bentonit esaslı kum kalıplar ile 200 °C’de ön ısıtılmış çelik kokil kalıplara yerçekimi yöntemiyle dökülmüştür. Optik mikroskop analizleri, kokil kalıba döküm yöntemiyle elde edilen numunelerde daha ince α-Al dendritleri, azalmış ikincil dendrit kol aralığı (SDAS) ve daha homojen dağılmış ötektik Si ağı yapısının oluştuğunu; buna karşın kum kalıba döküm numunelerinde daha kaba dendritik yapı ve düzensiz Si kümelenmeleri gözlendiğini ortaya koymuştur. Bu mikroyapısal farklılıklar, mekanik özelliklerde belirgin farklılıklar yaratmıştır: kokil kalıba döküm yöntemiyle üretilen alaşım, Brinell sertliğinde yaklaşık %18 ve çekme dayanımında %10–15 oranında artış göstermiştir. Ayrıca darbe enerjisi 4,81 J’den 5,07 J’ye yükselmiş olup, bu artış daha ince ve homojen bir katılaşma yapısına bağlı olarak gelişen daha yüksek enerji soğurma ve kırılma tokluğunu yansıtmaktadır. Elde edilen sonuçlar, döküm sürecinin kontrol edilmesinin—özellikle soğuma hızının artırılmasının—herhangi bir kimyasal modifikasyon veya ısıl işlem uygulanmadan A360 alaşımının mukavemetini önemli ölçüde artırabileceğini göstermektedir. Bu çalışma, süreç–yapı–özellik ilişkisine dair temel bir bilimsel bakış açısı sunmakta ve yüksek bütünlüğe sahip alüminyum bileşenlerin otomotiv ve havacılık uygulamaları için sürdürülebilir üretim tasarımlarına pratik bir referans oluşturmaktadır.

Anahtar Kelimeler

A360 alüminyum alaşımı , çekme dayanımı , darbe enerjisi , mikroyapı , kokil kalıp döküm , kum kalıp döküm , sertlik

Kaynakça

• Callegari, B., Lima, T. N., & Coelho, R. S. (2023). The influence of alloying elements on the microstructure and properties of Al-Si-based casting alloys: A review. Metals, 13(7), 1174.
• Niu, G., Wang, Y., Zhu, L., Ye, J., & Mao, J. (2022). Fluidity of casting Al–Si series alloys for automotive light-weighting: a systematic review. Materials Science and Technology, 38(13), 902-911.
• Dillibabu, S. P., Vasudevan, B., Megaraj, M., Palanivel, A., Durvasulu, R., & Manjunathan, K. (2023). Aluminum and its alloys in automotive and aerospace applications review. In 5th International Conference on Innovative Design, Analysis & Development Practices in Aerospace & Automotive Engineering: I-DAD’22 (Vol. 2766, No. 1, p. 020027). AIP Publishing LLC.
• Yağcı, T., Cöcen, Ü., Çulha, O., & Korkmaz, A. (2021). Alüminyum Döküm alaşimlarina dair son yillardaki akademik Ve endüstriyel gelişmelere genel bakiş ve değerlendirme. Uludağ Üniversitesi Mühendislik Fakültesi Dergisi, 26(3), 1191-1210.
• Bharath, C., Shamanth, V., & Hemanth, K. (2021). Studies on mechanical behaviour of AlSi10Mg alloy produced by selective laser melting and A360 alloy by die casting. Materials Today: Proceedings, 45, 78-81.
• Wang, X., Zhang, D., Li, A., Yi, D., & Li, T. (2024). A review on traditional processes and laser powder bed fusion of aluminum alloy microstructures, mechanical properties, costs, and applications. Materials, 17(11), 2553.
• Kocaman, E., & Şirin, S. (2023). Effect of Al5Ti1B grain refiner and Al10Sr modifier on mechanical properties and corrosion behavior of A360 alloy. International Journal of Automotive Science And Technology, 7(1), 30-36.
• Ludwig, T. H., Dæhlen, E. S., Schaffer, P. L., & Arnberg, L. (2014). The effect of Ca and P interaction on the Al–Si eutectic in a hypoeutectic Al–Si alloy. Journal of alloys and compounds, 586, 180-190.
• Yuan, S., Peng, J., Wang, W., Zhan, Y., Zeng, J., Gan, P., & Ji, J. (2025). Effects of Sc–Er rare earth on solidification microstructure and mechanical properties of A360 alloy. International Journal of Metalcasting, 19(3), 1532-1545.
• Karacif, K., Hasırcı, H., & Candemir, D. (2025). The effects of aging and cryogenic treatments on corrosion and hardness properties of A-360 aluminum alloys. Journal of the Faculty of Engineering and Architecture of Gazi University, 40(2).
• Özdemir, B. (2024). Ballistic Performance of ETİAL-171 (A360) Aluminium. Savunma Bilimleri Dergisi, 20(1), 49-60.
• Li, Y., Liu, J., Huang, W., & Zhang, S. (2022). Microstructure related analysis of tensile and fatigue properties for sand casting aluminum alloy cylinder head. Engineering Failure Analysis, 136, 106210.
• Shaha, S. K., Czerwinski, F., Kasprzak, W., Friedman, J., & Chen, D. L. (2015). Microstructure and mechanical properties of Al–Si cast alloy with additions of Zr–V–Ti. Materials & Design, 83, 801-812.
• Dash, S. S., & Chen, D. (2023). A review on processing–microstructure–property relationships of Al-Si alloys: Recent advances in deformation behavior. Metals, 13(3), 609.
• Li, Q., Wu, H. J., Lu, S. P., Kong, L. J., & Hao, Q. T. (2014). Microstructure and mechanical properties of permanent mold low-pressure casting and sand mold gravity casting of A357 alloy. Advanced Materials Research, 1004, 1055-1061.
• Safari, M., Keikha, M. M., & Kamarei, A. (2012). An investigation on semi-solid forming of A360 aluminium alloy by mechanical stirring. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 226(3), 205-215.
• Neuser, M., Grydin, O., Andreiev, A., & Schaper, M. (2021). Effect of solidification rates at sand casting on the mechanical joinability of a cast aluminium alloy. Metals, 11(8), 1304.
• Yan, H., Zhu, C., Wu, Z., & Gao, W. (2020). Effect of Sb addition on the Al–Si eutectic of hypoeutectic Al–Si casting alloys under different cooling rates. Materials Transactions, 61(1), 181-187.
• Yajjala, R. K., Inampudi, N. M., & Jinugu, B. R. (2020). Correlation between SDAS and mechanical properties of Al–Si alloy made in Sand and Slag moulds. Journal of Materials Research and Technology, 9(3), 6257-6267.
• Khan, A. A., Kaiser, M. S., & Kaiser, M. (2023). Wear studies on Al-Si automotive alloy under dry, fresh and used engine oil sliding environment. Research on Engineering Structures and Materials, 9(1), 1-18.
• Žbontar, M., Petrič, M., & Mrvar, P. (2021). The influence of cooling rate on microstructure and mechanical properties of AlSi9Cu3. Metals, 11(2), 186.
• Zhang, L. Y., Jiang, Y. H., Ma, Z., Shan, S. F., Jia, Y. Z., Fan, C. Z., & Wang, W. K. (2008). Effect of cooling rate on solidified microstructure and mechanical properties of aluminium-A356 alloy. Journal of materials processing technology, 207(1-3), 107-111.
• Barrirero, J., Pauly, C., Engstler, M., Ghanbaja, J., Ghafoor, N., Li, J., ... & Mücklich, F. (2019). Eutectic modification by ternary compound cluster formation in Al-Si alloys. Scientific reports, 9(1), 5506.
• Adapala, P., Avey, T., Yuan, Y., Lim, M. L., Bhaskaran, G., Das, S., ... & Frankel, G. S. (2024). Understanding the effect of microstructure and composition on localized corrosion susceptibility of 6xxx aluminum alloys. npj Materials Degradation, 8(1), 52.
• Xu, Z., Chen, T., Li, B., Wang, C., Yang, S., Chen, Y., ... & Guan, R. (2025). Optimization of process parameters and microstructure prediction of A360 al-alloy during die casting. International Journal of Metalcasting, 1-13.
• Yang, J., Liu, B., Shu, D., Li, H., Yang, Q., Hu, T., ... & Zou, S. (2025). Effect of Casting Pressure on Porosity, Microstructure, and Mechanical Properties of Large Die Casting Aluminum Alloy Parts. International Journal of Metalcasting, 1-15.
• Jiang, B., Ji, Z., Hu, M., Xu, H., & Xu, S. (2019). A novel modifier on eutectic Si and mechanical properties of Al-Si alloy. Materials Letters, 239, 13-16.
• Meena, L. K., Seshagiri, R., & Singh, R. (2023). Corrosion behavior of strontium modified Al-12Si cast alloys in flowing and stagnant chloride containing media. Journal of Alloys and Compounds, 962, 171157.
• Jie, L. L., Baig, M. F., & Mhd Noor, E. E. (2024). Effects of Strontium Modification on Corrosion Resistance of Al-Si Alloys in Various Corrosive Environments. Materials, 17(19), 4923.
• Wang, C., Lao, Y., Liang, S., Zhao, Q., Yan, Y., & He, K. (2025). Improved microstructure, mechanical and corrosion properties of Sb-modified A356 alloy by La addition. Materials Today Communications, 113140.
• Bohane, P., Bandi, S., Karthikeyan, R., Deshmukh, P., Gohil, T. B., & Srivastav, A. K. (2025). On the Improved Mechanical Properties and Corrosion Resistance in LM6 Alloy Through Eutectic Modification. JOM, 77(3), 1208-1219.
• Ganesh, M. S., Reghunath, N., J. Levin, M., Prasad, A., Doondi, S., & Shankar, K. V. (2022). Strontium in Al–Si–Mg alloy: a review. Metals and Materials International, 28(1), 1-40.
• Karakoca, A., & Yılmaz, S. O. (2024). Effect of Sr-Ti-B and T6 Heat Treatment on Microstructure and Mechanical Properties of Sand Cast A360 Alloy. International Journal of Metalcasting, 1-13.
• Shlyarov, V. V., Shlyarova, Y. A., Bashchenko, L. P., & Zagulyaev, D. V. (2025). Waste reduction and implementation of environmentally safe and efficient production processes using high-silicon alloys of the Al–Si system. Izvestiya. Ferrous Metallurgy, 68(3), 239-247.
• Shabestari, S. G., & Moemeni, H. (2004). Effect of copper and solidification conditions on the microstructure and mechanical properties of Al–Si–Mg alloys. Journal of Materials Processing Technology,153, 193-198.
• Bharath, C., Shamanth, V., & Hemanth, K. (2021). Studies on mechanical behaviour of AlSi10Mg alloy produced by selective laser melting and A360 alloy by die casting. Materials Today: Proceedings, 45, 78-81.
• Miladinovic, S., Stojanović, B., Gajević, S., Ivanović, L., & Skulić, A. (2022, December). A review of hypereutectic aluminum piston materials. In IOP Conference Series: Materials Science and Engineering, Vol. 1271, No. 1, p. 012011). IOP Publishing.
• Wang, L. F., Sun, J., Yu, X. L., Shi, Y., Zhu, X. G., Cheng, L. Y., ... & Guo, L. J. (2018). Enhancement in mechanical properties of selectively laser-melted AlSi10Mg aluminum alloys by T6-like heat treatment. Materials Science and Engineering: A, 734, 299-310.
• Sunar, T., & Cetin, M. (2021). Manufacturing of B4C particle reinforced A360 aluminium cellular composite materials by the integration of stir casting and space holder methods. journal of composite materials, 55(25), 3763-3773.
• Uslu, E., Çatar, R., & Çolak, M. (2017). Si ve Cu elementleri içeren alüminyum döküm alaşimlarinin korozyon özelliklerinin belirlenmesi ve karşilaştirilmasi. Engineering Sciences, 12(3), 133-140.
• Lu, Z., Zhang, L., Wang, J., Yao, Q., Rao, G., & Zhou, H. (2019). Understanding of strengthening and toughening mechanisms for Sc-modified Al-Si-(Mg) series casting alloys designed by computational thermodynamics. Journal of Alloys and Compounds, 805, 415-425.
• Rooy, E. L., & Kaufman, J. G. (2004). Aluminum Alloy Castings: Properties, Processes, and Applications (No. B-ASM-002). SAE Technical Paper.
• Mbuya, T. O., Odera, B. O., & Ng'Ang'A, S. P. (2003). Influence of iron on castability and properties of aluminium silicon alloys: literature review. International Journal of Cast Metals Research, 16(5), 451-465.
• Ravi, K. R., Pillai, R. M., Amaranathan, K. R., Pai, B. C., & Chakraborty, M. (2008). Fluidity of aluminum alloys and composites: A review. Journal of Alloys and Compounds, 456(1-2), 201-210.
• Kaufman, J. G. (2000). Introduction to aluminum alloys and tempers. ASM international.
• Vončina, M., Kores, S., Mrvar, P., & Medved, J. (2011). Effect of Ce on solidification and mechanical properties of A360 alloy. Journal of Alloys and Compounds, 509(27), 7349-7355.
• Cai, Q., Mendis, C. L., Chang, I. T., & Fan, Z. (2020). Microstructure evolution and mechanical properties of new die-cast Al-Si-Mg-Mn alloys. Materials & Design, 187, 108394.
• Li, Q., Xia, T., Lan, Y., Li, P., & Fan, L. (2013). Effects of rare earth Er addition on microstructure and mechanical properties of hypereutectic Al–20% Si alloy. Materials Science and Engineering: A, 588, 97-102.
• Jeon, J. H., Shin, J. H., & Bae, D. H. (2019). Si phase modification on the elevated temperature mechanical properties of Al-Si hypereutectic alloys. Materials Science and Engineering: A, 748, 367-370.
• Vander Voort, G. F. (Ed.). (2004). Metallography and microstructures. ASM International.
• Vander Voort, G. F. (2021). Metallographic techniques in failure analysis. ASM International.
• Zhang, P., Li, Z., Liu, B., Ding, W., & Peng, L. (2016). Improved tensile properties of a new aluminum alloy for high pressure die casting. Materials Science and Engineering: A, 651, 376-390.
• Ru, M. A., Yong, W. A. N. G., & Li-ying, Y. A. N. G. (2012). Growth mechanism of primary silicon in cast hypoeutectic Al-Si alloys. Transactions of nonferrous metals society of china, 22(6), 1264-1269.
• Hekimoğlu, A. P., Çalış, M., & Ayata, G. (2018, June). Stronsiyum ve Stronsiyum-Magnezyum katkılarının Al-9Si Alaşımının Yapısal ve Mekanik Özelliklerine Etkisi. In SETSCI-Conference Proceedings (Vol. 2, pp. 422-426). SETSCI-Conference Proceedings.
• Bayar, H., Subasi, M., & Karatas, C. (2015). SiC takviyeli alüminyum alaşım matrisli kompozit malzemenin yüksek basınçlı kalıp dökümü ve mekanik özellikleri. Gazi University Journal of Science Part C: Design and Technology, 3(4), 603-612.
• Herfurth, K., & Scharf, S. (2021). Casting. In Springer Handbook of Mechanical Engineering. Cham: Springer International Publishing.