CHARACTERIZATION OF CARBON IN MECHANICALLY ALLOYED C-1O AT-PERCENT-FE POWDER

Mechanical alloying (MA) of iron and graphite was performed for C-10 at%Fe alloy by the use of a conventional ball mill. The structure of mechanically alloyed samples were examined by X-ray diffraction, transmission electron microscopy. A spectrometric approach to the change of structure during the milling process was carried out by carbon K alpha X-ray-emission band spectroscopy and electron energy loss spectroscopy. Finely dispersed iron particles with a grain size of about 10 nm into graphite powder particles were obtained after 1000 h of MA. Spectrometric results suggested that fracturing of graphite of graphite crystal progressed by three steps; fracturing along the hexagonal plane, fracturing the hexagonal networks and amorphization. The electron state of carbon atom in the ball milled sample was energized to form sp(3) hybrid orbital, after applying pressuring.