Evolution of Aluminium Melt Quality of A356 After Several Recycling


Gursoy O., Erzi E., Tur K., Dispinar D.

ARCHIVES OF FOUNDRY ENGINEERING, cilt.20, sa.4, ss.61-66, 2020 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 20 Sayı: 4
  • Basım Tarihi: 2020
  • Doi Numarası: 10.24425/afe.2020.133348
  • Dergi Adı: ARCHIVES OF FOUNDRY ENGINEERING
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Applied Science & Technology Source, Compendex, Directory of Open Access Journals
  • Sayfa Sayıları: ss.61-66
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Recyclability is one of the great features of aluminium and its alloys. However, it has been typically considered that the secondary aluminium quality is low and bad. This is only because aluminium is so sensitive to turbulence. Uncontrolled transfer and handling of the liquid aluminium results in formation of double oxide defects known as bifilms. Bifilms are detrimental defects. They form porosity and deteriorate the properties. The detection and quantification of bifilms in liquid aluminium can be carried out by bifilm index measured in millimetres as an indication of melt cleanliness using Reduced Pressure Test (RPT). In this work, recycling efficiency and quality change of A356 alloy with various Ti additions have been investigated. The charge was recycled three times and change in bifilm index and bifilm number was evaluated. It was found that when high amount of Ti grain refiner was added, the melt quality was increased due to sedimentation of bifilms with Ti. When low amount of Ti is added, the melt quality was degraded.