ملخص: In an attempt to prepare amorphous Fe77Cr4P8C11 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 Mossbauer spectrometry. During the first stage of milling (up to 12 h), detailed analyses of the diffraction patterns and the Mossbauer spectra reveal a complete dissolution of the elemental powders and the formation of FexP (1 x 3P phosphides and Fe3C carbide in addition to [alpha]-(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)7C3 and [var epsilon]'-Fe2.2C with the phosphide (Fe,Cr)3P type phase embedded in the amorphous matrix.

لغة: إنجليزية