Vibroacoustic monitoring of the intermetallic phase formation when electron-beam technology surface alloying

Synthesis of intermetallic phases of AlNi system using surface alloying technology on the surface of aluminum alloy products is not highly stable, so it seems appropriate to use diagnostic systems. In such cases, the method of vibroacoustic signal registration can be used, since it allows to control the kinetics of the process and phase transformations associated with the change in volume. Under the action of a low-energy high-current electron beam, the appearance of a vibroacoustic wave is due to the effect of thermoelasticity in a thin surface layer capable of providing a reaction of self-propagating high-temperature synthesis between a thin film of a titanium or nickel alloy and an aluminum substrate. Tracking changes in the effective value of the vibroacoustic signal make it possible to clearly state the formation of the intermetallic phase and select rational modes of irradiation. (paper)