Abstract
In an attempt to prepare amorphous Fe 77Cr 4P 8C 11 alloy by mechanical alloying, powder mixtures of Fe, Cr, P and C (activated carbon) with a purity of 99.9% have been ball milled, under argon atmosphere for several periods up to 90 h, in a planetary ball mill (Fritsch P7). The structure and microstructure of the milled powders have been characterised, as a function of milling time, by X-ray diffraction and Mössbauer spectrometry. During the first stage of milling (up to 12 h), detailed analyses of the diffraction patterns and the Mössbauer spectra reveal a complete dissolution of the elemental powders and the formation of Fe x P (1 < x < 2), Fe 3P phosphides and Fe 3C carbide in addition to α-(Fe,Cr) phase. The amorphous like state is reached after 32 h of milling. Further milling leads to the appearance of new carbides such as (Fe,Cr) 7C 3 and ɛ′-Fe 2.2C with the phosphide (Fe,Cr) 3P type phase embedded in the amorphous matrix.
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