Fabrication and Mechanical Behavior of Aluminum Matrix Composites Reinforced with Nano Alumina Particles

Year 2019, , 1341 - 1350, 31.07.2019

Mevlüt Gürbüz , Mahmut Can Şenel

https://doi.org/10.29130/dubited.518527

Abstract

In the
present work, nano alumina (Al₂O₃) reinforced aluminum
(Al) matrix composites with various alumina content (0-2.5wt.%) were fabricated
by powder metallurgy method. This method occurs of mixing, ultrasonic
dispersion, filtering, drying, pressing, and sintering processes. The effects
of nano alumina amount on the Vickers hardness, apparent density, compressive
strength, and microstructure of nano alumina reinforced aluminum matrix
composites were investigated. The maximum apparent density (2.66 g/cm³),
Vickers hardness (43±1 HV), and compressive strength (130±3 MPa) were
determined at Al-2wt.%Al₂O₃ composite. After 2wt.% nano
alumina content, the agglomeration was detected by a scanning electron
microscope (SEM). This agglomeration deteriorated the mechanical properties of
nano alumina reinforced aluminum composites.

 

Keywords

Aluminum, Alumina, Hardness, Density, Strength

Fabrication and Mechanical Behavior of Aluminum Matrix Composites Reinforced with Nano Alumina Particles

Abstract

Bu
çalışmada nano alümina (Al₂O₃) takviyeli alüminyum (Al)
matrisli kompozitler (ağ. % 0-2.5) toz metalurjisi yöntemiyle üretilmiştir. Bu
yöntem karıştırma, ultrasonik dağıtma, filtreleme, kurutma, presleme ve
sinterleme işlemlerinden oluşmaktadır. Nano alümina miktarının Vickers
sertliği, yoğunluk, basma dayanımı ve kompozitlerin mikroyapıları üzerindeki
etkileri incelenmiştir. Maksimum yoğunluk (2.66 g/cm³), Vickers
sertliği (43±1 HV) ve basma dayanımı (130±3 MPa), ağırlıkça % 2 Al₂O₃
takviyeli Al kompozit yapıda elde edilmiştir. Ağırlıkça %2 nano alümina
katkısından sonra, topaklanma oluşumu taramalı elektron mikroskobu (SEM) ile
tespit edilmiştir. Bu topaklanmalar nano alümina takviyeli alüminyum
kompozitlerin mekanik özelliklerini olumsuz etkilemiştir.

Keywords

Alüminyum, Alümina, Sertlik, Yoğunluk, Dayanım

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