Nanostructured composites and functionally graded materials based on Al-Al₂O₃ or Al_xMe_y-Al₂O₃ systems can be produced in situ by liquid phase processing due to reacting molten aluminum with reactive oxide. In general way such process may be expressed by the following oxy-redox reactions:
2Al+3/yMeO_y= Al₂O₃+3/yMe
(x+2)Al+3/yMeO_y= Al₂O₃+Al_xMe_3/y
where MeO_y is an oxide, which is reactive to Al, and according to widely accepted opinion it should be wettable by molten Al; Al_xMe_3/y is intermetallic phase.

The paper presents the experimental results on wettability and reactivity in different couples with simple oxide (Al/SiO₂, Al/ZnO, Al/B₆O, Al/TiO₂, Al/ZrO₂, Al/CoO, Al/NiO), binary oxides of SiO₂-Al₂O₃ system and complex oxides of SiO₂-Al₂O₃-Fe₂O₃-TiO₂-CaO-MgO type.

The analysis of factors affecting wetting and transformation kinetics in Al/reactive oxide couples has been done taking into account structural, physical and mechanical properties of initial oxide reactant and morphology of resulting microstructures.

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