Microstructures and mechanical properties of bulk nanocrystalline Fe_3AI materials with 5,10 and 15 wt. Cu prepared by aluminothermic reaction

摘要

Bulk nanocrystalline Fe_3AI based materials with 5, 10 and 15 wt. % Cu were prepared by aluminothermic reaction in which the melts were superheated about 1600 K before solidification. Microstructures of those materials were investigated by optical microscope, electron probe microanalysis, X-ray diffraction and transmission electron microscope. It was shown that microstructures of the materials consisted of a nanocrystalline matrix phase and a little contamination Al_2O_3 and Fe_3AlC_x fiber phases.