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The patterns in changes of microstructure, microhardness, distribution of alloying elements, dislocation density are studied during the cold tight interference fi t of 450 microns and subsequent thermal heating in the temperature range of phase α→β-transformation in the contact area of the permanent joint of the "bushing —shaft" samples made of OT4-1 alloy . The temperature-time interval of the phase pre-transformation of accelerated diffusion processes for the formation of diffusion OT4-1 alloy permanent joint corresponding to heating in autovacuum at temperature of 975...1000 °C with exposure time of 20 to 60 minutes is revealed.