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Fe-MoNiAl-Al 2 O 3  powders were mechanically alloyed by a SPEX type attritor. The Fe based composite samples were reinforced with complex mechanically alloyed Fe-MoNiAl-Al 2 O 3  particles in different ratios and Fe matrix composites were obtained. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), elemental surface mapping and microhardness tests were used to analyze the microstructures of the composites. The sintered composites showed that thin Al 2 O 3  particles were dispersed. High volume fractions of the reinforcement having nanometer dimensions were produced in metallic matrices. Additionally, as the content of Al 2 O 3  increased, the micro-hardness increased, which indicates that fine Al 2 O 3  particles had a reinforcing effect.

Characterization of mechanically alloyed Fe based and MoNiAl+Al 2 O 3 reinforced composites