Effect of Aging Heat Treatment on the Mechanical and Tribological Behavior of Graphene and SiC Reinforced Al 6xxx Hybrid Composites

Öz

Aluminum matrix hybrid composites are an important material group for lightweight structural applications due to their low density, high specific strength, and improvable wear resistance. In the production of aluminum matrix hybrid composites, SiC reinforcement increases hardness and load-bearing capacity, while graphene contributes to tribological performance by reducing friction through its layered structure. In this study, Al 6xxx matrix hybrid composites reinforced with 10 and 20 wt.% SiC and 0,1 and 0,3 wt.% graphene were produced by powder metallurgy using elemental powders and subjected to aging heat treatment. The density, hardness, microstructure, and dry sliding wear behavior of the produced hybrid composites were investigated. After aging, the highest hardness value was obtained as 47,5 HB in the 6.1.20 sample reinforced with 0,1 wt.% graphene and 20 wt.% SiC. The lowest specific wear rate was determined as 2,24 × 10-6 cm3/N·m in the 6.1.20 sample, whereas the lowest coefficient of friction was measured as 0,48 in the 6.3.10 sample reinforced with 0.3 wt.% graphene and 10 wt.% SiC.

Anahtar Kelimeler

• Powder metallurgy
• Aluminium
• Graphene
• Silicon carbide
• Aging heat treatment

Al 6xxx Matrisli Grafen ve SiC Takviyeli Hibrit Kompozitlerde Yaşlandırma Isıl İşleminin Mekanik ve Tribolojik Davranışa Etkisi

Öz

Alüminyum matrisli hibrit kompozitler, düşük yoğunluk, yüksek özgül dayanım ve iyileştirilebilir aşınma direnci nedeniyle hafif yapısal uygulamalar için önemli bir malzeme grubudur. Alüminyum matrisli hibrit kompozitlerin üretiminde tercih edilen SiC takviyesi sertlik ve yük taşıma kapasitesini artırırken, grafen tabakalı yapısı sayesinde sürtünmeyi azaltarak tribolojik performansa katkı sağlamaktadır. Bu çalışmada, Al 6xxx matrisli %10 ve %20 SiC, %0,1 ve %0,3 grafen takviyeli hibrit kompozitler elementel tozlar kullanılarak toz metalurjisi yöntemiyle üretilerek yaşlandırma ısıl işlemi uygulanmıştır. Üretilen hibrit kompozitlerin yoğunluk, sertlik, mikroyapı ve kuru kayma aşınma davranışı incelenmiştir. Yaşlandırma sonrası en yüksek sertlik değeri %0,1 grafen ve %20 SiC takviyeli 6.1.20 numunesinde 47,5 HB olarak elde edilmiştir. En düşük özgül aşınma oranı 6.1.20 numunesinde 2,24 × 10-6 cm3/N·m olarak belirlenirken, en düşük sürtünme katsayısı %0,3 grafen ve %10 SiC takviyeli 6.3.10 numunesinde 0,48 olarak tespit edilmiştir.

Anahtar Kelimeler

• Toz metalurjisi
• Alüminyum
• Grafen
• Silisyum karbür
• Yaşlandırma ısıl işlemi

Kaynakça

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