This article presents the results of studying the structural-phase state changes of Ti-Al coatings on the surface of titanium synthesized by mechanical alloying. The study of the substrate-coating boundary showed the practical absence of traces of diffusion of the coatings in the titanium substrate after the mechanical alloying process. The mechanism of formation of Ti-Al coatings is due to cold welding and due to deformation compaction of powder particles on the surface of titanium under the impact of ball hits. Stirring of coating components with the formation of diffusion zones at the interfaces is observed after annealing at 600 ºC. Al3Ti is the first phase that forms in the coatings as a result of the interaction of Ti and Al. The compounds Al2Ti and TiAl are formed as a result of subsequent reactions between Ti and Al3Ti. After the process of mechanical alloying, heat treatment should be used as a complex treatment to accelerate the diffusion processes in the coating-substrate system.Keywords: Coating, mechanical alloying, structural-phase state, intermetallic compound, heat treatment
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