Mechanical synthesis in the iron oxide–metal system

The specific features of dynamic dissolution of iron oxides in metals (Fe, Ni, Cr, Zr, Ti and Al) under high-pressure compression shear at 300 K and their subsequent precipitation during thermal annealing were analyzed using Mِssbauer spectroscopy, X-ray diffraction analysis, and transmission electron microscopy. Dissolution of iron oxides and formation of secondary oxides with matrix metals during deformation and subsequent annealing depended on the ability of metals to form solid solutions and chemical compounds with iron and oxygen. Formation of secondary oxides was accompanied by evolution of the surface of boundaries, providing conditions for formation of a nanocrystalline structure. It is shown that deformation-induced transport of oxygen atoms from iron oxides of low stability to the metal matrix is possible, and the formation of special oxides suitable for oxide dispersion-strengthening is demonstrated.