The influence of the laser radiation power density on physical-chemical structure and microhardness amorphous alloy FeSi$_6$B$_{16}$

In work discusses the results of investigations of the influence of a focused pulsed laser radiation on amorphous alloy FeSi$_6$B$_{16}$. The methods of scanning probe microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and microhardness measurements show changes in the structure, microhardness, surface topography, redistribution elements in the irradiated system, depending on the various power density of the laser radiation.
It is found that a focused laser radiation at selected values of laser radiation power density leads to high-temperature heating of a radiation area of amorphous samples FeSi$_6$B$_{16}$. It is shown that with increase in the laser power density can be achieved either melting only the alloy surface or also and his inner layers. The samples were irradiated with the laser power density equal $1\cdot10^8$ W/cm$^2$ leads to a strong thermal heating of his surface layers with spread of the thermal wave front into the inner layers of the system. The melt which has turned out as a result of it in volume after cooling contains crystal phases. Identify the phase on the difraktogramma with a small number of reflections has not been possible, but it is possible to assume that solid solution of boron into $\alpha$-Fe is formed. In favor of this assumption can be the processed XPS-data showing a decrease in boron concentration in the surface layers due to its diffusion into the inner layers of the alloy. Increased microhardness of samples observed at the same time may be directly related to forming a solid solution of boron in $\alpha$-Fe, which increases strength properties of materials.