Synthesis and characterization of (Fe,Ti)3Al-Al2O3 nanocomposite via Fe2O3 reduction by Al

Subject Areas :

M. Rafiei ¹ , M.H. Enayati ² , F. Karimzadeh ³

1 - Islamic Azad University, Najafabad Branch
2 - Isfahan University of Technology, Department of Materials Engineering
3 - Isfahan University of Technology, Department of Materials Engineering

Received: 2016-04-20 Accepted : 2017-09-12 Published : 2017-08-23

Keywords: nanocomposite, Ball milling, DTA, Intermetallic Compound,

Abstract :

In this research the (Fe,Ti)3Al-Al2O3 nanocomposite was synthesized via the reduction of Fe2O3 by Al during mechanical alloying (MA). For this purpose the Al, Ti and Fe2O3 powders were mixed with molar ratio of 3:1:1in a planetary ball mill. The structural and morphology of powder particles during different milling times were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). In order to study the thermal behavior of powder particles, Heat treatment and differential thermal analysis (DTA) were done. It was found that, the reaction of nanocomposite formation is occurred in two stages during MA. The first and second reactions were reduction of Fe2O3 by Al and (Fe,Ti)3Al formation, respectively. The crystallite size and internal strain of powder particles for Al2O3 phase after 100 h of MA, were 20 nm and 3%, respectively. Also ball milling for long time led to the reduction of Fe2O3 by Al before Al melting during DTA.

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