Metallurgical and Materials Transactions A

, Volume 49, Issue 5, pp 1948–1961 | Cite as

Freezing Range, Melt Quality, and Hot Tearing in Al-Si Alloys

  • Muhammet Uludağ
  • Remzi Çetin
  • Derya Dispinar


In this study, three different aluminum-silicon alloys (A356, A413, and A380) that have different solidification morphology and solidification ranges were examined with an aim to evaluate the hot tearing susceptibility. T-shape mold and Constrained Rod Casting (CRC) mold were used for the characterization. Reduced Pressure Test (RPT) was used to quantify the casting quality by measuring bifilm index. It was found that bifilm index and solidification range have an important role on the hot tearing formation. As it is known, bifilms can cause porosity and in this case, it was shown that porosity formed by bifilms decreased hot tearing tendency. As the freezing range of alloy increases, bifilms find the time to unravel that reduces hot tearing. However, for eutectic alloy (A413), due to zero freezing range, regardless of bifilm content, hot tearing was never observed. A380.1 alloy had the highest tendency for hot tearing due to having the highest freezing range among the alloys investigated in this work.



Special thanks to Murat Akcin from MagmaSoft, Istanbul, Turkey for the simulations. This work has been supported by the Scientific Research Projects Coordination Unit of Selcuk University (Project Number: 13101026). Muhammet Uludağ was a Ph.D. student at Selcuk University, during the publication process, and he started working at Bursa Technical University. Author would like to thank to TUBITAK (Turkey) for its support.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Muhammet Uludağ
    • 1
  • Remzi Çetin
    • 2
  • Derya Dispinar
    • 3
  1. 1.Metallurgical and Materials Engineering DepartmentBursa Technical UniversityBursaTurkey
  2. 2.Materials Engineering DepartmentKTO Karatay UniversityKonyaTurkey
  3. 3.Metallurgical and Materials Engineering DepartmentIstanbul UniversityIstanbulTurkey

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