Mekanik Alaşımlama Yöntemi ile Üretilen Nanoyapılı Al66Co20Cu14 Tozlarının Termal ve Mikroyapısal Özellikleri

Bu çalışmada, Al66Co20Cu14 alaşımı elementel tozlarından mekanik alaşımlama (MA) yöntemi ile üretilmiştir.Farklı öğütme aşamalarında MA ile üretilen alaşımın mikroyapısal değişiklikleri ve termal davranışları,diferansiyel termal analiz (DTA), X-ışını kırınımı (XRD) ve taramalı elektron mikroskobu (SEM) enerji yayılımlıX-ışını analizi (EDX) kombinasyonu ile araştırılmıştır. XRD sonuçları Al2Cu, Al13Co4 gibi yeni intermetalikfazların oluşumunu göstermiştir. Öğütme süresine bağlı olarak tane büyüklüğü kırılma ve deformasyon sonucuküçülerek 25.2 nm olarak ölçülmüştür. 100 saatlik öğütme ile üretilen numune için faz geçiş aktivasyon enerjilerihesaplandı ve sonuçlar üretilen alaşımın termal kararlılığa sahip olduğunu göstermiştir. Ayrıca, numunelerimmikroyapısı ve toz bileşenlerin alaşım içerisindeki dağılımı, SEM/EDX sonuçlarına göre öğütme süresi arttıkçatane boyutunda küçülme ve daha homojen bir yapı oluştuğunu bulunmuştur.

Thermal and Microstructural Properties of Nanostructured Al66Co20Cu14 Powders Produced by Mechanical Alloying Method

In this study, Al66Co20Cu14 alloy is produced from its elemental powders by mechanical alloying (MA) method. Microstructural changes and thermal behavior of the alloy produced by MA in different grinding stages were investigated by a combination of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy diffusion X-ray analysis (EDX). XRD results showed the formation of new intermetallic phases, such as Al2Cu, Al13Co4. Depending on the milling time, the grain size was reduced to 25.2 nm as a result of the fracture and deformation. For the sample produced with 100 hours of milling, the phase transition activation energies were calculated and the results showed that the alloy produced had thermal stability. In addition, the microstructure of the samples and the distribution of the powder components in the alloy, according to the SEM/EDX results, it was found that as the grinding time increased, the grain size decreased and a more homogeneous structure was formed.

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