Investigation of the structure and properties of high-entropy alloy Zr-Nb-Ti-Ta-HF surface-modified by high velocity oxygen fuel spraying

Abstract

We developed a complex formation method of composite high-entropy coatings using material with thermoelastic martensitic transformations, including high velocity oxygen fuel (HVOF) of mechanically activated powders in a protective atmosphere, followed by thermal and thermomechanical processing. The method allowed us to form a nanoscale state in composite layers with an increased level of mechanical and operational properties. Based on complex metallophysical studies of coatings (electron microscopy, spectroscopy, X-ray phase, calorimetric, durometric analysis), we obtained new information on the nanoscale composition within the surface-modified layer, on its mechanical properties, phase composition, which determines the functional properties. This allows finding ways of their targeted formation for various operating conditions.