T6 ısıl işlem uygulanmış, alüminyum oksit (Al₂O₃) ile takviye edilmiş Al-5Cu kompozitlerinin mikro yapısı, sertlik ve yoğunluk incelenmesi

Öz

Alüminyum-Bakır (Al-Cu) kompozitleri, alüminyum ve bakırın faydalı özelliklerini sinerjik bir şekilde birleştiren bir metal matrisli kompozit (MMC) sınıfını temsil eder ve hafif yapı, yüksek mukavemet ile üstün termal ve elektriksel iletkenlik arasında benzersiz bir denge sunar. Saf alüminyum veya bakıra kıyasla geliştirilmiş performansları nedeniyle bu kompozitler, havacılık, otomotiv, elektronik ve ileri imalat gibi birçok alanda büyük ilgi görmektedir. Bu çalışma, alümina (Al₂O₃) ile takviye edilmiş Al-5Cu kompozitlerinin toz metalurjisi yöntemiyle üretimini ve karakterizasyonunu araştırmaktadır. Yüksek saflıkta Al ve Cu tozları, mikro yapı, sertlik ve yoğunluk üzerindeki etkilerini incelemek amacıyla %1, %3 ve %5 oranlarında alümina ile karıştırılmıştır. Toz karışımları soğuk presleme yöntemiyle sıkıştırılmış ve ardından çözümleme tavlaması ve yapay yaşlandırma aşamalarını içeren T6 ısıl işlemine tabi tutulmuştur. Elde edilen sonuçlar, Al₂O₃ takviyesinin kompozit özelliklerini olumlu yönde etkilediğini göstermiştir. Yoğunluk ölçümleri, Al₂O₃ içeriğiyle birlikte artış eğilimi göstermiş ve en yüksek yoğunluk %3 takviyede elde edilmiştir. Vickers sertlik testleri ise önemli bir sertlik artışı ortaya koymuş; en yüksek sertlik değeri (64 HV) %5 Al₂O₃ içeren kompozitte ölçülmüştür. Mikroyapı analizi, Al₂O₃ parçacıklarının matris içinde homojen olarak dağıldığını doğrulamış, ancak optik mikroskop analizlerinde dağlama zorlukları nedeniyle tane sınırları net olarak ayırt edilememiştir. Mekanizma açısından, Al₂O₃ parçacıkları, dislokasyon hareketini engelleyerek ve tane incelmesini teşvik ederek sertliği artırmıştır; ancak kesin tane boyutu analizi yapılamamıştır. Kompozitlerde belirgin bir faz ayrışması gözlenmemiştir ve gözlenen mekanik iyileşmeler, karışım kuralı ve parçacık takviyesi mekanizmalarıyla uyumlu olmuştur. Bu bulgular, Al₂O₃ takviyesinin Al-5Cu kompozitlerinin sertliğini ve mikroyapısal bütünlüğünü etkili bir şekilde artırdığını ortaya koymaktadır.

Anahtar Kelimeler

• Alüminyum-Bakır (Al-Cu) kompozitler
• Alümina (Al2O3)
• Mikro sertlik
• Mikro yapılar

Teşekkür

Türkiye'deki Gaziantep Üniversitesi tarafından yürütülen bilimsel araştırma programından (BAP) (MF.DT.20.06) alınan finansman için teşekkür ederiz.

The Microstructure, Microhardness, and Density Investigation of T6 Heat Treated Al-5Cu Composites Reinforced with Alumina

Öz

Aluminium-copper (Al-Cu) metal matrix composites combine the best qualities of copper and aluminium, providing exceptional electrical and thermal conductivity, high strength and a lightweight design. These composites have attracted significant interest for use in advanced manufacturing, electronics, the automotive industry and the aerospace sector. In this work, powder metallurgy was used to fabricate and analyze Al-5Cu composites reinforced with aluminum oxide (Al2O3). High-purity Al and Cu powders were mixed with different ratios of Al2O3 (1%, 3%, and 5% by weight) to examine their effects on microstructure, microhardness, and density of Al-Cu composite. The T6 process, which includes solution treatment and artificial aging, was used to heat treat the powder blends following cold pressing. The results showed that density increased along with the Al2O3 content, reaching a peak of 3%. Vickers microhardness tests showed a significant improvement, with the 5% Al2O3 composite having the highest microhardness (64 HV0.1). Microstructural analysis confirmed a uniform distribution of Al2O3, even though etching made it difficult for optical microscopy to clearly show grain boundaries. The Al2O3 particles mechanistically increased microhardness by preventing dislocation movement and encouraging grain refinement, despite the difficulty of making accurate measurements of grain size. The composites displayed a consistent microstructure with no observable phase segregation, and the mechanical improvements were in line with predictions made by the rule of mixtures and particle reinforcement theories. It was concluded that Al2O3 addition successfully increases the microhardness and microstructural stability of Al-5Cu composites.

Anahtar Kelimeler

• Aluminum-Copper (Al-Cu) composites
• Alumina (Al2O3)
• Microhardness
• Microstructures

Teşekkür

Funding from the scientific research program (BAP) administered by Gaziantep University in Turkey (MF.DT.20.06) is acknowledged.

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