EN RU   [ Home page ] [ E-mail page ]
Surface nanostructuring

   An irradiation of materials by an intense pulsed electron beam on the RITM machine modifies its structural-phase state in the near-surface region. The thin melt of the material formed on the surface of the target starts cooling at a high rate upon termination of the pulse. As a result, the melt overcools, thus considerably increasing the probability of solid phase nucleation, and hence increasing the concentration of the nucleation centres, in other words, causing refinement of the grains. Upon irradiation, the grain size on the surface can be hundreds or even tens of nanometers. Thus, the irradiation leads to formation of near-surface nanostructures whose physical properties are substantially different from those of the coarse-grained structures. The figure shows a nanostructured surface of a titanium alloy after irradiation.