T. F. Grigoreva

Structural transformations upon the mechanochemical interaction between solid and liquid metals

The process of mechanochemical interaction of solid and liquid metals is examined. It is shown that the mechanochemical formation of solid solutions in all the cases occurs through the stages of the formation of stable intermetallic compounds.

Preparing Ultradisperse Copper Powder via the Mechanochemical Reduction of Copper Oxides by Magnesium

The mechanochemical reduction of copper (I and II) oxides by magnesium is studied by means of X-ray phase analysis, electron microscopy, and EDS elemental analysis. The conditions for separating copper particles from other products and protecting copper from oxidation during storage are determined. The sizes of the obtained aggregated particles of reduced copper (~100 nm) are estimated via scanning electron microscopy.

Studying the Possibility of Obtaining High-Temperature Composites via Mechanochemical and Electron-Beam Treatment

Mechanochemical and electron-beam treatment allow new high-temperature composites to be obtained faster and with less consumption of energy. Model experiments on obtaining the high-temperature composite materials are performed using a combination of tungsten and titanium diboride powders.

Magneto-Abrasive Materials

Magneto-abrasive materials, obtained via the joint mechanical activation of magnetic (metal) and abrasive (diamond, silicon carbide) components in a high-energy planetary-type ball mill, are studied by means of XRD phase analysis and optical and scanning-electron microscopy. It is shown that a metallomatrix structure forms in an Fe/diamond system after only 10 min of mechanical activation. Diamond particles are ground from 40–50 μm to 0.5–3 μm and distributed over the volume of the iron matrix. Study of the abrasive properties of Fe/silicon carbide composite applied to zirconium alloy shows that an Fe/SiC composite obtained via 10 min of mechanical activation ensures the greatest reduction in the weight of the material and the lowest level of roughness.

Synthesis of hafnium carbide by mechanochemistry and irradiation

The interaction in the Hf–C system during mechanical activation performed in a high-energy planetary ball mill and the irradiation-assisted fabrication of hafnium carbide from an Hf/C mechanocomposite are studied by synchrotron X-ray diffraction (at a quantum energy of 33.7 keV) and high-resolution scanning electron microscopy. The mechanochemical interaction results in the formation of an Hf/C mechanocomposite at the first stage and mechanical activation for ≥8 min forms hafnium carbide. The irradiation of the Hf/C mechanocomposite with a high-energy electron beam (~150 W/mm2) causes melting and spreading of hafnium over the carbon particle surface and the crystallization of hafnium carbide.