Bor ile yapılan tane inceltmenin Al-30Zn alaşımının mikroyapı ve mekanik özelliklerine etkisi

Yıl 2019, Cilt: 34 Sayı:1, 523 - 534, 26.03.2019

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

https://doi.org/10.17341/gazimmfd.416512

Cited By: 4

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.

Kaynakça

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