Comparison of Different Amount of Cerium and Silicon in Aluminum Alloys

Öz

The aim of this study is the synthesis and the microstructural investigation of Al-Ce alloys, which can be a good alternative to commercial Al-Si alloys that can be used at a limited level especially in high temperature applications. Within this context, commercially available Al-9Si, Al-12.5Si and Al-18Si (wt. % Si) alloys and Al-13.5Ce, Al-18Ce and Al-27Ce (wt. % Ce) alloys were compared. While α-Al, eutectic Al-Si, primary Si structures were observed in Al-Si alloys; α-Al, eutectic fine Al11Ce3 and primary coarse Al11Ce3 intermetallic particles were identified in Al-Ce alloys. In addition, while Al11Ce3 phase decreased depending on the increase of added Ce amount in Al-Ce alloy, the amount and size of coarse Al11Ce3 intermetallic structures increased. The increase in the amount of alloying elements added to the alloy increased the hardness values of the alloys. When the hardness values of these two alloys group were compared, it was observed that the hardness values of Al-Ce alloys were lower than that of Al-Si alloys.

Anahtar Kelimeler

• Aluminum Alloys
• Cerium
• Silicon
• Eutectic Phase
• Microstructure
• Hardness

Farklı Miktarlarda Seryum ve Silisyum İçeren Alüminyum Alaşımlarının Karşılaştırılması

Öz

Bu çalışmanın amacı, özellikle yüksek sıcaklık uygulamalarında sınırlı seviyede kullanılabilen ticari Al-Si alaşımlarına iyi bir alternatif olabilecek Al-Ce alaşımlarının sentezlenmesi ve mikroyapısal açıdan incelenmesidir. Bu kapsamda ticari olarak Al-9Si Al-12,5Si ve Al-18Si (ağırlıkça % Si) alaşımlarıyla, Al-13,5Ce, Al-18Ce ve Al-27Ce (ağırlıkça % Ce) alaşımları karşılaştırılmıştır. Al-Si alaşımlarında α-Al, ötektik Al-Si, birincil Si yapıları, Al-Ce alaşımlarında ise α-Al, ötektik ince Al11Ce3 ve birincil kaba Al11Ce3 intermetalik parçacıklarının olduğu tespit edilmiştir. Al-Ce alaşımı içerisine katkılandırılan Ce miktarı artışına bağlı olarak ötektik Al11Ce3 fazı azalırken, kaba Al11Ce3 intermetalik yapılarının miktarı ve iriliği artmaktadır. Alaşım içerisine katkılandırılan alaşım elementleri miktarının artışı, alaşımların sertlik değerlerini arttırmıştır. Bu iki alaşım grubunun sertlik değerleri karşılaştırıldığında Al-Si alaşımlarının sertlik değerleri Al-Ce alaşımlarından daha yüksek olduğu tespit edilmiştir.

Anahtar Kelimeler

• Alüminyum alaşımları
• Seryum
• Silisyum
• Ötektik faz
• Mikroyapı
• Sertlik

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