Abstract
In the present study, (Fe,Cr)3Al/20 vol% Al2O3 nanocomposite was prepared through mechanochemical reactions during ball milling and successfully bulked using a combination of cold isostatic press and sintering at 1400 °C for 1 h. Two processing approaches were utilized to produce (Fe,Cr)3Al/Al2O3 nanocomposite: The first was milling of Fe, Cr, Al and Fe2O3, while the second one was milling of Fe, Cr, Al and Cr2O3, both in stoichiometric condition, to synthesize (Fe,Cr)3Al/20 vol% Al2O3. Structural changes of powder particles during mechanical alloying were studied by X-ray diffraction. The microstructure and the morphology of powder particles and bulk samples were also studied by scanning electron microscopy and transmission electron microscopy. Microstructural analysis showed that mechanochemical reactions took place during milling, and nanometric Al2O3 was uniformly distributed in the matrix. The results also showed that the second approach required a considerably higher milling time to produce (Fe,Cr)3Al/Al2O3 nanocomposite, as compared to the first one. For this reason, bulk samples were produced from the synthesized nanocomposite in the first approach. The microstructure of the sintered samples consisted of a network structure of (Fe,Cr)3Al and Al2O3 phases with superior mechanical properties.
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