The study of the fine structure of Ti-Al coatings on the surface of Ti, obtained by mechanical alloying

The work is devoted to the study of structural-phase transformations in composite coatings (Ti-Al)+Ti during mechanical alloying. The data on the structural-phase states of (Ti-Al)-Ti coatings after mechanical alloying have been obtained, confirming the mechanism of formation of the modified layer due to deformation compaction of powder particles on the titanium surface under mechanical action. As a result of mechanochemical fusion, a TiAl$_{3} $ phase with a bcc lattice ($ I4/mmm $ structure) was detected, which corresponds to the stable state of the TiAl$_{3} $ alloy. Under conditions of mechanical alloying of the structure, $ I4/mmm $ transforms into the $ L1_{2} $ structure, which corresponds to the metastable state of TiAl$_{3} $.