Akademik Veri Yönetim Sistemi
4th International Conference on Applied Engineering and Natural Sciences, Konya, Türkiye, 10 - 13 Kasım 2022, ss.1401-1405, (Tam Metin Bildiri)
Aluminum and its alloys are frequently used in engineering applications due to their superior properties. One of the major challenges in casting aluminum alloys is the formation of hot cracks during solidification. One of the methods used to prevent this defect is grain refinement. Literature research has revealed that Al5Ti1B master alloy does not have a sufficient grain refinement effect due to silicon poisoning that occurs at high silicon ratios. Therefore, in this study, the effectiveness of this master alloy and the efficiency of the particles formed with in-situ reactions in the structure were compared in aluminum alloys containing different silicon ratios. According to the obtained results, it has been observed that titanium-boron compounds, which is frequently preferred for grain refinement in industrial applications, is insufficient in alloys containing high silicon amounts. It has been also revealed that NbB2 and Al3Nb compounds formed in the structure have a more effective grain refinement function even at high silicon ratios. In addition to examining the grain structures, cooling curves were also investigated. As a result of the thermal analysis, the amount of undercooling decreased more significantly with the addition of Nb-KBF4 powders compared to the Al5Ti1B master alloy.