CORRELATION OF HARDNESS AND SILICON MORPHOLOGY FOR Al-Si-Sb ALLOY

Uzun O., Yilmaz F., Emeksiz C., Ergen S., Kolemen U.

ARCHIVES OF METALLURGY AND MATERIALS, cilt.63, sa.1, ss.467-472, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 63 Sayı: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.24425/118963
  • Dergi Adı: ARCHIVES OF METALLURGY AND MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.467-472
  • Anahtar Kelimeler: Al-Si alloy, casting, Vickers, finite element analysis, MECHANICAL-PROPERTIES, AL-20SI-5FE ALLOYS, AL-12SI ALLOY, MICROSTRUCTURE, NA, SR
  • Yozgat Bozok Üniversitesi Adresli: Hayır

Özet

In this study, we have focused on the role of silicon morphology on the hardness of eutectic Al - 12 wt.% Si - 0.5 wt.% Sb alloy solidified at different cooling rates. The alloys were produced by using induction melting, arc-remelting and melt-spinning techniques. The cooling rates of the alloys were determined as 0.5, 60 and similar to 10(5)degrees C.s(-1) for induction-melted, arc-remelted and melt-spun alloy. The experimental results show that as the cooling rate increased the coarse silicon phase was substantially refined and its morphology altered from sharp need-like to round shape. Two exothermic peaks, attributed to precipitation and coarsening of silicon from supersaturated alpha-Al, were observed in the DSC curve of MS alloy. Vicker's hardness of melt-spun alloy was found two times higher than those of IMed and ARed alloys. The lowest hardness of induction-melted alloy was ascribed to the lamellar morphology of silicon, yielding decohesive rupture. This result was confirmed by finite element analyzing.