Effects of Sintering Time on Density and Microstructure of Al-15Si-2.5Cu-0.5Mg / B4C Composites in Microwave Sintering Process


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Aydoğan S. İ. , Özer M. , Çinici H. , Özer A.

International Conference on Advanced Materials Science Engineeringand High Tech Devices Applications Exhibition (ICMATSE 2020), Ankara, Türkiye, 2 - 04 Ekim 2020, ss.70-74

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.70-74

Özet

In this study, B4C (5, and 10 wt.%) particle-reinforced Al-15Si-2,5Cu-0,5Mg (Ecka Alumix 231®) aluminum matrix composites were produced through cold pressing technique. Samples were sintered by microwave sintering technique. Sintering was carried out at 555 °C for 15, 30, 45, 60 minutes holding times and without holding time. Density measurement, microstructure analysis and hardness tests of the produced samples were carried out. Densities of samples before and after sintering were measured by Arshiment method according to ASTM B962-08. Optical microscope and scanning electron microscope (SEM) were used in microstructure studies. Macrohardness measurements were performed in terms of Brinell hardness by use of 31,5 kgf load and 2.5 mm ball diameter. The green density of the samples decreased with increasing B4C wt.%. Compared to the green density values, density values of all samples had decreasing with the sintering process. The highest density values in sintered samples were obtained in 60 minutes sintering time. Al-rich solid solution, primary Si and Cu and Mg-rich phases in the microstructure were determined through SEM and EDS analysis.