Musa BİLGİN, Ahmet ÖZDEMİR, Şener KARABULUT

Alüminyum Magnezyum Alaşımlarının Sürtünme Karıştırma Kaynağı İle Kaynak Edilebilirliğinin Değerlendirilmesi

Hava, kara ve deniz taşımacılığında kullanılan araçlarda sera gazı emisyonlarını azaltmanın ve enerji korunumu artırmanın en iyi yollarından biri alüminyum ve magnezyum gibi daha hafif ve dayanıklı malzemeler kullanmaktır. Fakat her iki metalin klasik ergitme kaynak yöntemleri ile birleştirilmelerinin zor olması ve özel işlem gerektirmeleri Al ve Mg alaşımlarının ortak yapılarda kullanımlarını sınırlandırmıştır. Bu çalışmada sürtünme karıştırma kaynak (SKK) yöntemi kullanılarak Al/Mg alaşımlarının birleştirilmesiyle ilgili yapılan çalışmalar değerlendirilerek, SKK yönteminin de kullanılan değişkenlerin (ilerleme hızı, devir sayısı, eğim açısı, eksenel dalma kuvveti, takım tasarımı, takım kaydırma mesafesi ve malzemelerin pozisyonları); kaynak kalitesi, mikro yapı ve mekanik özellikler üzerine etkileri incelenmiştir. Al/Mg malzeme çiftinin SKK yöntemi ile birleştirilmesinde kaynak kalitesini etkileyen en önemli unsur birleşme bölgesinde oluşan gevrek yapıdaki Al3Mg2 (β) ve Al12Mg17 (γ) intermetalik bileşiklerdir. Al/Mg alaşımların SKK yöntemi ile birleştirilmesinde kaynak bölgesinin çekme dayanımı, ana metal Al alaşımının çekme dayanımının % 60 üstünde oluşabilmektedir.

Anahtar Kelimeler:

Alüminyum alaşımı, Magnezyum alaşımı, Sürtünme karıştırma kaynağı

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