MEKANİK ÖĞÜTME VE SİNTERLEME YÖNTEMLERİNİN AA2024 ALAŞIMININ SERTLİK, YOĞUNLUK, MİKRO YAPI ÖZELLİKLERİNE ETKİSİ

Öz

Bu çalışma, AA2024 alaşımı tozlarının Mekanik öğütme ve farklı üretim süreçleri kombinasyonunun nihai ürünün içyapı, yoğunluk ve sertlik özelliklerine etkisi değerlendirilmiştir. Mekanik öğütme işlemi sonucunda tozlarda morfolojik dönüşüm ve dislokasyon yoğunluğunda artış gözlenmiş, bu durum içyapıda daha fazla soğuk kaynak izine ve ince tanelere neden olmuştur. Sıcak pres sinterleme ile partikül sınırlarında meydana gelen oksit tabakasının basınç altında kırılması ve atomik difüzyon yoluyla partiküller arası bağların güçlenmesi sonucu yoğunluk ve sertlikte önemli artışlar elde edilmiştir. Özellikle Mekanik öğütme ile sıcak pres sinterlemenin bir arada kullanıldığı S1 numunesinde, en düşük gözeneklilik (%1,8±0,25) ve en yüksek sertlik/yoğunluk (120,3±1,35HB; 2,73±0,025g/cm3) değerleri tespit edilmiştir. Elde edilen sonuçlar, sinterleme sıcaklığı ve basıncının yanı sıra Mekanik öğütme gibi ön işlemlerin Al alaşımlarının performansında belirleyici bir rol oynadığını ortaya koymuştur.

Anahtar Kelimeler

• AA2024
• Mekanik öğütme
• Toz Metalurjisi
• Mikro yapı
• Mekanik Özellik

EFFECTS OF MECHANICAL MILLING AND SINTERING TECHNIQUES ON THE HARDNESS, DENSIFICATION, AND MICROSTRUCTURAL CHARACTERISTICS OF AA2024 ALLOY

Öz

This study investigates the influence of mechanical milling combined with various production routes on the microstructural, densification, and hardness characteristics of AA2024 alloy powders. The mechanical milling process resulted in notable morphological transformation and increased dislocation density within the powders, promoting finer grain structures and more evident cold welding traces. During hot press sintering, the oxide layer present along particle boundaries was fragmented under applied pressure, enabling atomic diffusion and enhancing interparticle bonding. These mechanisms led to significant improvements in both density and hardness. Among all samples, the one processed through the combination of mechanical alloying and hot pressing (labeled S1) exhibited the lowest porosity (%1,8±0,25) and the highest density and hardness values (120,3±1,35HB; 2,73±0,025g/cm3. The findings clearly demonstrate that not only sintering temperature and applied pressure, but also pre-treatments such as mechanical alloying, play a decisive role in determining the final performance of aluminum alloy components.

Anahtar Kelimeler

• AA2024
• Mechanical milling
• Powder Metallurgy
• Microstructure
• Mechanical Properties

Kaynakça

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