İkincil A356 Alüminyum Alaşımlarına Düşük Miktarlarda Eklenen Lantan, Titanyum ve Zirkonyum Elementlerinin Mikroyapı, Mekanik ve Korozyon Özelliklerine Etkisi

Öz

Son yıllarda nadir toprak elementlerinin döküm sonrası mikroyapılar ve alüminyum alaşımlarının mekanik özelliklerine olan etkisi büyük ilgi çekmiştir. Ancak bugüne kadar nadir bulunan toprak elementi olan lantanın (La) mikroalaşım seviyesinde ilavesiyle geri dönüştürülmüş-ikincil A356 alaşımının katılaşması üzerindeki etkisi ve korozyon özelliklerine etkisi hakkında bir çalışma bulunmamaktadır. Bu çalışmada %0.1’ in altındaki La ilavesi Ti ve Zr ile birlikte yapılmış, böylece pahalı olan nadir toprak elementinin eser seviyelerde ilavesinin etkileri de raporlanmıştır. Çalışma kapsamında mikroalaşım elementi La, Ti ve Zr’ un neden olduğu α-Al tane incelmesi, ötektik faz modifikasyonu, korozyon performansı ve mekanik özelliklerdeki meydana gelen değişiklikler araştırılmıştır. La ilavesinin düşük seviyelerde bile, ötektik faz için etkili heterojen çekirdeklenme koşullarını bozabileceği ve ötektiği inceltebileceği gösterilmiştir. Ağırlıkça %0.05 La ilavesinin yanında %0.2 Ti eklenmesi ile ideal α-Al tane inceltmesi, ötektik faz modifikasyonu ve alaşımların mekanik özellik iyileşmesinin sağlanması için yeterli olduğu bulunmuştur. Bunun yanında, çalışmadaki La ile mikroalaşımlandırılan tüm ikincil A356 alaşımlarında korozyon özellikleri gerilemiştir. Korozyon daldırma testleri sonucunda, mikroyapılar kaba hücresel yapıdan ince hücresel yapıya dönüşmüş olsalar bile farklı çözünürlükler ve difüzyon özellikleri, alüminyum matriste heterojen bölgeler yaratarak korozyon dayanımını düşürdüğü sonucuna varılmıştır.

Anahtar Kelimeler

• lantan
• tane inceltmesi
• ikincil A356
• mekanik özellikler
• korozyon

Effect of Lanthanum, Titanium and Zirconium Elements Added in Low Amounts to Secondary A356 Aluminum Alloys on Microstructure, Mechanical and Corrosion Properties

Öz

In recent years, there has been a lot of interest in the effects of rare earth elements on microstructures and the mechanical properties of aluminum alloys after casting. However, until now, no study has looked at the impact of adding lanthanum(La), a rare earth element, at the micro-alloy level on the solidification of recyled secondary A356 alloy and its corrosion properties. In this study, the addition of La below 0.1 % was made together with Ti and Zr, so that the effects of the addition of trace levels of the expensive rare earth element were also reported. Within the scope of the study, α-Al grain refinement, eutectic phase modification, corrosion performance and changes in mechanical properties caused by microalloying elements La, Ti and Zr were investigated. It has been shown that the addition of La, even at low levels, can disrupt the effective heterogeneous nucleation conditions for te eutectic phase and thin the eutectic. It was found that the addition of 0.05 wt% La and 0.2 wt.% Ti is sufficient to achieve ideal α-Al grain refinement, eutectic phase modification and mechanical property improvement of the alloys. In addition, the corrosion properties of all secondary A356 alloys microalloyed with La in the study were reduced. As a result of corrosion immersion tests, it was concluded that even if the microstructures changed from coarse to fine cellular, different solubilities and diffusion properties created heterogeneous regions in the aluminium matrix, reducing the corrosion resistance.

Anahtar Kelimeler

• Lanthanum
• grain refining
• secondary A356
• mechanical properties
• corrosion

Kaynakça

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