Mekanik alaşımlama ile üretilen Al4.5Cu/TiO2 kompozitlerinin mikroyapı, sertlik ve termal özellikleri

Öz

Al4.5Cu/TiO2 kompozitleri, mekanik alaşımlama yöntemiyle elemental tozlarından üretilmiştir. Kompozitlerin mikroyapısal ve termal özellikleri, diferansiyel termal analiz (DTA), enerji dağılımlı X-ışını algılamalı taramalı elektron mikroskobu (SEM-EDX) ve X-ışını kırınımının (XRD) bir kombinasyonu ile araştırıldı. Öğütme süresine bağlı olarak mikroyapısal evrimler, faz dönüşümleri ve kristalit boyutu değişiklikleri incelenmiştir. XRD ve SEM sonuçları, öğütme süresinin artması nedeniyle daha homojen bir yapı ve tane boyutunda küçülme olduğunu göstermiştir. DTA sonuçları, Al'nin erime sıcaklığını gösteren yaklaşık 650 oC’de bir endotermik pik gösterdi. Ayrıca, preslenmiş ve sinterlenmiş kompozitlerin mekanik özellikleri Vickers mikro sertlik testi ile incelenmiştir. Sonuçlar, öğütme süresinin 5 saatten 10 saate çıktığında mikrosertlik değerlerinin önemli ölçüde arttığını göstermiştir. 10 saat öğütme sonrasında maksimum mikrosertlik değeri, ağırlıkça %20 TiO2'li Al4.5Cu kompozit için 173±10 HV elde edilmiştir.

Anahtar Kelimeler

• Metal matrisli kompozitler
• termal özellikler
• mikro yapı
• mekanik alaşımlama.

Proje Numarası

1919B011701225

Microstructure, Hardness and Thermal Properties of Al4.5Cu/TiO2 Composites Produced by Mechanical Alloying

Öz

Al4.5Cu/TiO2 composites were fabricated from their elemental powders by the mechanical alloying method. Microstructural and thermal properties of the composites were investigated by a combination of differential thermal analysis (DTA), scanning electron microscopy with energy dispersive X-ray detection (SEM-EDX), and X-ray diffraction (XRD). Microstructural evolutions, phase transformations, and crystallite size changes were investigated depending on the milling time. XRD and SEM results showed that there were a more homogeneous structure and shrinkage in grain size due to the increased milling time. The DTA results showed an endothermic peak of around 650 oC which indicates the melting temperature of Al. Besides, the mechanical properties of the pressed and sintered composites were investigated by Vickers micro-hardness testing. The results showed that microhardness values significantly increased as milling time increased from 5h to 10h. The maximum microhardness value of 173±10 HV was obtained for Al4.5Cu with 20 wt% TiO2 composite after milling for 10h.  

Anahtar Kelimeler

• Metal matrix composites
• thermal properties
• microstructure
• mechanical alloying

Destekleyen Kurum

TUBITAK [2209-A]

Proje Numarası

1919B011701225

Teşekkür

We would like to thank TUBITAK [2209-A] for providing financial support (Project No:1919B011701225).

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