CORRELATION OF HARDNESS AND SILICON MORPHOLOGY FOR Al-Si-Sb ALLOY
ARCHIVES OF METALLURGY AND MATERIALS, cilt.63, sa.1, ss.467-472, 2018 (SCI-Expanded, Scopus)
- 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.