The results of structural-phase conversions in a zirconium coating-silicon substrate system treated with low-energy high-current electron beams (LHEBs) are presented. It is revealed that the action of LHEBs with energy densities of 8-10 J/cm2 leads to the formation of a eutectic layer containing clusters with a characteristic size of 40-50 nm (the melt of ZrSi2 and silicon) at the zirconium-silicon interface. After the energy density reaches 12 J/cm2, silicon dendrites and regions of silicide crystallites are formed in the surface layer 20-30 μm thick. Data on the characteristic sizes of dendrites and eutectic clusters have made it possible to perform numerical estimation of the surface-melt overcooling (12-25 K), the temperature gradients (3. 7 × 107-1. 6 × 108 K/m), and the interphase boundary velocity (0. 8-3. 2 × 10-4 m/s).
ASJC Scopus subject areas
- Surfaces, Coatings and Films