Abstract
The excess energy transferred by high energy mills in the mechanical synthesis (mechanosynthesis) of nanophase alloys and compounds is evaluated in two iron containing systems, Fe–C and Fe–Cu. Powders treated by high energy milling are analysed by Mössbauer spectroscopy and X-ray diffraction, the latter technique allowing also the determination of the dimensions of the crystal size. The model for energy effects in alloys introduced by Miedema and the thermochemical estimates proposed for ball milled nanocrystalline metals and compounds by Fecht is exploited to evaluate energetic effects in the treated powders. Experimental kinetic data obtained are discussed on an engineering base, allowing an estimation of the mechanochemical power transferred in the nanocrystalline powders.
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