Al7075-B4C Kompozitlerin Tribolojik Özelliklerinin ve Mikroyapısının İncelenmesi

Öz

Bu çalışmada, Al7075 matrisli B4C takviyeli kompozitler toz metalürjisi ve sıcak presleme yöntemleri ile üretilmiştir. Al7075 matrise ağırlıkça %1, 3, 6, 9, 12, 15 ve 30 oranlarında B4C ilave edilmiştir. Üretilen kompozitlerin deneysel yoğunluğu, Vickers sertliği, aşınma oranı ve sürtünme katsayısı belirlenmiştir. Elde edilen sonuçlara göre en yüksek deneysel yoğunluk (2,63 g/cm3), Vickers sertliği (226 HV) ile en düşük aşınma oranı ((0,000091 mm3/(Nm)), kütle kaybı (0,0012 g) ve sürtünme katsayısı (0,4) Al7075-30B4C kompozitte elde edilmiştir. Ayrıca yapılan mikroyapı analizleri ile bu kompozitte mikroyapının daha yoğun olduğu gözlemlenmiştir. Çalışma sonucunda Al7075 alaşımına belirli katkı oranında (ağırlıkça %30) B4C ilave edildiğinde kompozitin mikroyapısının ve tribolojik özelliklerinin iyileştiği tespit edilmiştir.

Anahtar Kelimeler

• Al7075
• B4C
• Toz metalürjisi
• Sıcak presleme
• Aşınma

Proje Numarası

PYO.MUH.1901.22.008

Investigation of Tribological Properties and Microstructure of Al7075-B4C Composites

Öz

In this study, B4C reinforced Al7075 matrix composites were produced by the powder metallurgy and hot-pressing methods. B4C was added to the Al7075 matrix at the rates of 1, 3, 6, 9, 12, 15 and 30wt.%. The experimental density, Vickers hardness, wear rate and friction coefficient of the produced composites were determined. According to the results obtained, the highest experimental density (2.63 g/cm3), Vickers hardness (226 HV) and the lowest wear rate ((0.000091 mm3/(Nm)), mass loss (0.0012 g) and friction coefficient (0.4) were obtained in Al7075-30B4C composite. In addition, the microstructural analyses showed that the microstructure was denser in this composite. As a result of the study, it was determined that when B4C was added to Al7075 alloy at a certain reinforcement ratio (30wt.%), the microstructure and tribological properties of the composite were improved.

Anahtar Kelimeler

• Al7075
• B4C
• Powder metallurgy
• Hot pressing
• Wear

Proje Numarası

PYO.MUH.1901.22.008

Kaynakça

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