Mekanik Alaşımla Süresince Al85Co7Y8 Alaşımının Faz Değişimi

Year 2017, Volume: 29 Issue: 2, 54 - 59, 16.08.2017

Barış Avar Musa Göğebakan

https://doi.org/10.7240/marufbd.292305

Cited By: 1

Abstract

Bu çalışmada
nanoyapılı Al₈₅Co₇Y₈ (at.%) alaşımı, mekanik
alaşımlama (MA) tekniği kullanılarak elemental tozların katı hal reaksiyonuyla
sentezlenmiştir. Toz alaşımlar, argon gazı altında sertleştirilmiş paslanmaz
çelik hazne ve bilyeler kullanılarak yüksek-enerjili bilyeli değirmen
içerisinde 300 saatlik öğütme işlemine tabi tutulmuştur. Öğütme işlemi süresince
numunelerdeki yapısal ve morfolojik değişimler X-ışını difraksiyonu (XRD) ve
taramalı elektron mikroskobu (SEM) ile termal kararlılıkları ise diferansiyel
termal analiz (DTA) ile incelenmiştir. MA işlemi sonucunda aşırı doymuş fcc-Al
katı çözelti fazı içeren alaşımlar üretilmiştir. Al₈₅Co₇Y₈
alaşımının 300 saatlik öğütme işlemi sonrasındaki kristalit boyutu yaklaşık 16
nm olarak bulunmuştur.

Keywords

Al-Co-Y alaşımı, Nanokristal alaşım, Mekanik alaşımlama, Faz değişimi

Phase Evolution of Al85Co7Y8 Alloy during Mechanical Alloying

Abstract

In
this study, the nanostructured Al₈₅Co₇Y₈
(at.%) alloy was synthesized by a solid state reaction from the constituent
elemental powder mixture via mechanical alloying (MA). The powder mixture was
ball milled for times up to 300 h in a planetary high energy mill using
hardened steel media under argon atmosphere. Structural and morphological
changes during the milling process were characterized by a combination of X-ray
diffraction (XRD) and scanning electron microscopy (SEM) techniques. Thermal
stability of the milled powders was investigated using differential thermal
analysis (DTA). The results showed that supersaturated α-Al solid solution was
formed in the whole content of the milled material. The mechanically alloyed Al₈₅Co₇Y₈
powder for 300 h of milling indicated the formation of fine nanoparticles with
a size of about 16 nm.

Keywords

Al-Co-Y alloy, Nanocrystalline alloy, Mechanical alloying, Phase evolution

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