T5 ve T6 ısıl işlemlerinin Zn-40Al-2Cu-0,1Sr alaşımının yapısal, mekanik ve tribolojik özelliklerine etkilerinin incelenmesi

Öz

Bu çalışmada T5 ve T6 ısıl işlemlerinin Zn-40Al-2Cu-0,1Sr alaşımının yapısal, mekanik ve tribolojik özelliklerine etkilerinin belirlenmesi amacıyla gerekli sayıda külçe kokil kalıba döküm yöntemiyle üretildi. Üretilen alaşımın yapı ve özellikleri uygun deneysel yöntemlerle araştırıldı. Söz konusu alaşımının dökülmüş durumdaki mikroyapısının α dendritleri ile dendritler arası bölgelerde yer alan ötektoid dönüşüm ürünü α+η, bakırca zengin ε (CuZn4) ve μ(SrZnx) fazlarından oluştuğu gözlendi. Uygulanan T5 ısıl işleminin bu alaşımın dendritik yapısında belirgin bir değişime yol açmadığı, T6 ısıl işleminin ise bu yapıyı önemli ölçüde değiştirdiği gözlendi. T5 ısıl işleminin incelenen alaşımın sertlik ve çekme dayanımını azaltırken kopma uzamasını az da olsa artırdığı belirlendi. T6 ısıl işleminin alaşımın sertlik ve çekme dayanımını artırdığı, kopma uzaması değerini ise azalttığı gözlemlendi. Yapılan değerlendirme sonucunda her iki ısıl işlemin de (T5 ve T6) söz konusu alaşımın aşınma direncini artırdığı belirlendi. Uygulanan ısıl işlemlerin alaşımın mekanik ve tribolojik özellikleri üzerindeki etkileri yapısal değişimlere dayandırılarak açıklandı.

Anahtar Kelimeler

• Zn-40Al-2Cu-0
• 1Sr alaşımı
• içyapı
• mekanik özellikler
• sürtünme
• aşınma
• Zn-40Al-2Cu-0.1Sr alloy
• microstructure
• mechanical properties
• friction
• wear

Destekleyen Kurum

RECEP TAYYİP ERDOĞAN ÜNİVERSİTESİ

Proje Numarası

FYL-2021-1245

Teşekkür

Bu çalışma Recep Tayyip Erdoğan Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimince Desteklenmiştir. Proje Numarası: FYL-2021-1245. İncelenen alaşımın dökümlerindeki katkısından dolayı Mak. Yük. Müh. Merve Çalış Özekinci’ye teşekkür ederiz.

Investigation of the effects of T5 and T6 heat treatments on the structural, mechanical, and tribological properties of Zn-40Al-2Cu-0.1Sr alloy

Öz

To assess the effects of T5 and T6 heat treatments on the structural, mechanical, and tribological properties of Zn-40Al-2Cu-0.1Sr alloy several ingots were produced by the permanent mold casting. The structure and properties of the alloy were investigated by appropriate test procedures. It was observed that the as-cast microstructure of the alloy consisted of α dendrites, eutectoid transformation product of α+η phase mixture, copper-rich ε (CuZn4), and μ(SrZnx) phase particles. T5 heat treatment had no significant effect on the dendritic microstructure of this alloy but T6 heat treatment removed it completely. It was also observed that T5 heat treatment decreased the hardness and tensile strength but caused a slight increase in the elongation to fracture of the alloy. T6 heat treatment caused an increase in the hardness and tensile strength of the alloy but decreased its elongation to fracture. It was also observed that both heat treatments (T5 and T6) increased the wear resistance of the alloy. The effects of the heat treatments on the mechanical and tribological properties of the alloy were explained in terms of microstructural changes.

Anahtar Kelimeler

• Zn-40Al-2Cu-0.1Sr alloy
• microstructure
• mechanical properties
• friction
• wear

Proje Numarası

FYL-2021-1245

Kaynakça

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