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ABSTRACT

Final qualifying work (baccalaureate work, thesis (design), Master's thesis) 75 pp., 18 figures, 3 tables, 26 sources, 2 applications, 14-sheet presentation.

Keywords: research, solid solutions of Fe-Si, the micro-structure of type B2 and DO3, the metastable phase Fe5Si3

The object of study is a solid solution of Fe-Si.

Purpose - to study the structure and types of ordering, is formed in the solid solution phase diagram of Fe-Si.

In the process of conducting a pilot study using electron microscopy and X-ray analysis.

The studies found that the ordering of type B2 and DO3 occurs by heterogeneity of the solid solution and achievement-tion corresponding to the stoichiometric composition in enriched areas or layers. At temperatures up to 700 ° C formed a two-phase structure of α + DO3, at 700 ° C and above - a two-phase structure of α + B2. The phase transition from the (α + DO3) to (α + B2) proceeds through the formation of a solid solution of the metastable phase Fe5 Si3. The results obtained are not consistent with accepted phase diagram in the field of solid solutions on the Status of areas as ordering and phase composition.

Results recommended for use in scientific research institutes and organizations involved in the study of phase transformations in alloys for further research and adjustment phase diagram of Fe-Si.

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