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AA2014 ALÜMİNYUM ALAŞIM TOZLARININ KARBON İLE SENTEZLENMESİ VE ÖZELLİKLERİ’NİN BELİRLENMESİ

ALLOYED AA2014 ALUMINIUM POWDERS SYNTHESIZED WITH CARBON AND DETERMINED PROPERTIES

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Powders of AA2014 aluminum alloy, were manufactured by the technique of gas atomization, using highly purified argon gas with 15 bar pressure. The powders were then separated in groups and the size distribution of each batch was determined via a particle size analyzer devices. Thereafter, the aluminum powders of 95 μm in optimum size were first blended with graphite, and later were all mechanically alloyed (MA) in a high energy vertical attritor. Besides the lubrication effect of graphite on MA, formation of Al4C3 phase was analyzed. Nevertheless Al4C3 precipitate formation could not be detected during and after the process of MA. Composite powder mixes of after MA, were then systematically analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and XRD techniques, respectively. In return, effect MA parameters on particle size and morphology, microstructure and microhardness of the final alloyed powders were investigated. It was found that mean particle size was almost the same by the end of 5 hours of MA, and the gradual increase in hardness of the composite particles was found to be because of the strain hardening took place during the process of MA.
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Abstract (Original Language): 
AA2014 alaşım tozları gaz atomizasyon ünitesinde yüksek saflıktaki argon gazı ile 15 bar basınç altında üretilmiştir. Elde edilen tozlar daha sonra elek analizi ve parçacık boyut analiz cihazlarında ayrıştırılmıştır. Ortalama 95 μm boyutundaki alaşım tozları, karbon tozu ile harmanlandıktan sonra dikey Attritör’de Mekanik Alaşımlama (MA) işlemine tabi tutulmuşlardır. Kuru yağlayıcı olarak karbonun MA işlemine etkisinin yanı sıra, Al4C3 fazının oluşum süreci incelenmiştir. Ancak MA esnasında ve sonrasında Al4C3 tespit edilmemiştir. Dikey değirmende harmanlanmış kompozit toz yapısı, taramalı elektron mikroskobu (SEM), tane boyut analizi, element dağılım spektrometresi (EDS) ve XRD cihazlarında analiz edilmiştir. MA parametrelerinin parçacık boyutuna, tane yapısı üzerine, mikro sertlik değerlerine ve tanelerin son mikro yapılarına olan etkileri tespit edilmeye çalışılmıştır. MA süresindeki artışa bağlı olarak ortalama toz boyutunun 5 saate kadar küçülmediği ve toz sertlik değerlerindeki yükselmenin ise hızlı pekleşmenin neticesinde meydana geldiği sonucuna varılmıştır.
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