Mekaniksel alaşımlama ile üretilen nanokristal Mg50Cu50 tozları

Bu çalışmada Mg ve Cu ikili karışımı ile nanokristal Mg50Cu50 kompozisyonlutoz alaşımı mekaniksel alaşımlama tekniği ile sentezlendi. Mekaniksel alaşımlama süresinin, toz alaşımın faz değişimine ve mikro sertliğine etkisi X-ışını kırınımı (XRD), taramalı elektron mikroskobu (SEM) ve Vickers mikro sertlik (HV) cihazı ile incelendi. Alaşımın mikro sertlik değeri artan mekaniksel alaşımlama zamanı ile yükseldi ve final ürün için ~600 Mpa olarak ölçüldü. Mg50Cu50 alaşımının kristal boyutu XRD piklerinin genişlemesi ile Debye Scherrer eşitliği kullanılarak hesaplandı. Toz alaşımın kristal boyutu ayrıca geçirimli elektron mikroskobu (TEM) ile teyit edildi ve yaklaşık 10 nm olarak belirlendi. Mekaniksel olarak alaşımlanan Mg50Cu50 tozlarının termal özellikleri diferansiyel taramalı kalorimetri ile (DSC) analiz edildi. DSC sonuçlarına göre ~ 650 ˚C’ de Magnezyum (Mg) elementinin erime sıcaklığına ait endotermik bir pik gözlendi.

Anahtar Kelimeler:

Nanokristal, Magnezyum alaşımı, Bakır Alaşımı, Mekaniksel Alaşımlama, XRD

Nanocrystalline Mg50Cu50 powders produced by mechanical alloying

In the present study, binary mixture of Mg and Cu with nominal composition of nanocrystalline Mg50Cu50 powder alloy was synthesized by mechanical alloying. The effect of mechanical alloying time on the phase evolution and microhardness of the powder alloy was investigated by X-Ray diffractometry (XRD), scanning electron microscopy (SEM) and Vickers microhardness (HV) tester. The micro hardness value of the alloy increased with increasing mechanical alloying time and it was measured ~600 Mpa for final product. The crystallite size of Mg50Cu50 alloy calculated with broadening of XRD peaks by Debye Scherrer equation. The crystallite size of the powder alloy was also confirmed by transmission electron microscopy (TEM) and it was determined approximately 10 nm. Thermal properties of the mechanically alloyed Mg50Cu50 powders were examined by differential scanning calorimetry (DSC). From DSC traces, an endothermic peak which belongs to melting point of Magnesium (Mg) element was observed at ~ 650 ˚C

Keywords:

: Nanocrystalline, Magnesium alloy, Copper alloy, Mechanical alloying, XRD,

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