Abstract
Formation mechanism of (Fe,Ti) 3Al–Al 2O 3 nanocomposite prepared by mechanical alloying of Fe, Al and TiO 2 with molar ratio of 6:7:3 was studied. The structural changes of powder particles during mechanical alloying were investigated by X-ray diffractometery. Morphology and microstructure of powder particles were characterized by scanning electron microscopy. It was found that during mechanical alloying Al first reacts with TiO 2 leading to the gradual formation of crystalline Ti and amorphous Al 2O 3 phases. In the second stage Ti and remaining Al diffuse into the Fe lattice and as a result a Fe(Al,Ti) solid solution develops. This structure transformed to (Fe,Ti) 3Al intermetallic compound at longer milling times. Heat treatment of this structure led to the crystallization of Al 2O 3 and ordering of (Fe,Ti) 3Al phases.
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