Production of Al-Cu-Mg Alloys Reinforced with High Al2O3 Ratios by Hot-Pressing Method

Abstract

Al-based alloys are used in many sectors such as aerospace, automotive and defense industries. Their low densities and high specific strength properties make Al and its alloys usable as engineering materials. When Al-based alloys are reinforced with ceramic particles, they can be used as new generation engineering materials with high hardness and strength. In this study, Al2O3 particles were reinforced to Al-Cu-Mg matrix by 10%, 20% and 40% by weight by mechanical alloying (MA) method and pressed by hot press (HP) method at 560 oC, 500 MPa pressing conditions. Particle size measurements after the MA treatment revealed that the particle sizes were reduced. The particle size measurement results of Al-Cu-Mg and Al2O3 particles before MA process were measured as 212.434 μm and 89.208 μm, respectively. The particle sizes after MA process were measured as 14.224 μm, 13.747 μm and 10.885 μm for 10%, 20% and 40% Al2O3 reinforced samples, respectively. The hardness values for the samples produced with 10%, 20% and 40% Al2O3 content were measured as 146.867 HV (0.5), 165.290 HV (0.5) and 206.843 HV (0.5), respectively.

Keywords

• Al2O3
• Al2024
• Mechanical Alloying
• Metal Matrix Composite
• Powder

Yüksek Al2O3 Oranları ile Takviye Edilmiş Al-Cu-Mg Alaşımlarının Sıcak Pres Yöntemi ile Üretimi

Abstract

Al esaslı alaşımlar havacılık, otomotiv ve savunma sanayi gibi birçok sektörde kullanılmaktadır. Düşük yoğunlukları ve yüksek özgül mukavemet özellikleri, Al ve alaşımlarını mühendislik malzemeleri olarak kullanılabilir hale getirir. Al esaslı alaşımlar seramik partiküller ile takviye edildiğinde yüksek sertlik ve mukavemete sahip yeni nesil mühendislik malzemeleri olarak kullanılabilirler. Bu çalışmada Al2O3 partikülleri Al-Cu-Mg matrisine ağırlıkça %10, %20 ve %40 oranında mekanik alaşımlama (MA) yöntemiyle takviye edilmiş ve 560 oC, 500 MPa pres koşullarında sıcak pres (SP) yöntemiyle preslenmiştir. MA işleminden sonra partikül boyutu ölçümleri, partikül boyutlarının azaldığını ortaya çıkarmıştır. Al-Cu-Mg ve Al2O3 partiküllerinin MA işlemi öncesi partikül boyutu ölçüm sonuçları sırasıyla 212,434 μm ve 89,208 μm olarak ölçülmüştür. MA işlemi sonrası partikül boyutları %10, %20 ve %40 Al2O3 takviyeli numuneler için sırasıyla 14,224 μm, 13,747 μm ve 10,885 μm olarak ölçülmüştür. %10, %20 ve %40 Al2O3 içeriği ile üretilen numunelerin sertlik değerleri sırasıyla 146,867 HV (0,5), 165,290 HV (0,5) ve 206,843 HV (0,5) olarak ölçülmüştür.

Keywords

• Al2O3
• Al2024
• Mekanik Alaşımlama
• Metal Matris Kompozit
• Toz Metalurjisi

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