Bor Katkılarının Al-30Zn Alaşımının İçyapı ve Mekanik Özelliklerine Etkisinin İncelenmesi

Ali Paşa Hekimoğlu, Yunus Emre Turan, İlhan İlker İsmailoğlu, Musab Ensar Akyol, Ercan Şen
60 11

Öz


Bu çalışmada bir adet ikili alüminyum-çinko (Al-30Zn) alaşımı ve dokuz adet üçlü alüminyum-çinko-bor [Al-30Zn-(0.01-2)B] alaşımı kokil kalıba döküm yöntemiyle üretildi. Üretilen alaşımların yapısal özellikleri ışık ve elektron mikroskobu incelemeleriyle, sertlik ve mekanik özellikleri ise üniversal test yöntemleriyle belirlendi. İkili Al-30Zn alaşımının içyapısının α dendritleri ile bu dendiritlerin etrafını saran η fazından oluştuğu, bu alaşıma bor ilavesi yapılması durumunda ise dendritlerin ve tane boyutunun küçüldüğü ve ayrıca dendirit sayısının arttığı görüldü. Artan bor oranı ile Zn-30Al-(0-2)B alaşımlarının sertliğinin sürekli arttığı, basma mukavemetinin azaldığı, çekme mukavemetlerinin ise %0.06 bor oranına artığı bu orandan sonra ise azaldığı görüldü. Bor katkılarının Zn-30Al alaşımın mekanik özelliklerinde yol açtığı değişimler içyapılarında neden olduğu değişimlere dayandırılarak açıklandı. 


Anahtar kelimeler


Alüminyum esaslı alaşımlar; Al-30Zn-B alaşımları; Tane inceltme; İçyapı; Mekanik özellikler.

Tam metin:

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Referanslar


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