Trosnikova I. Directional reinforced composites of Mo-Si-B, WC-W2C multifunctional purpose.

The work is dedicated to creation of reinforced composite materials with high strength and hardness multifunctional purpose through process management structure formation during directional solidification of eutectic alloys of Mo-Si-B, WC-W2C. The diagram of fusibility of MoSi2-MoB2 quasi-binary systems has been built. Mechanical properties of eutectic alloy were investigated, it was found that reinforced composites have higher strength and lower values of high-temperature creep. The effect of cooling rate on the microstructure, phase composition, morphology and the stress-strain state phase components, mechanical properties of doped and undoped relit it was found. It is found that the increase in hardness is 1.5 times and 2-4 times the strength of relit, which is used on an industrial scale for the hardening of machine parts and mechanisms operating under abrasive wear and high contact loads, caused the formation of the character of the structure, size and tensions deformed state of phase components.The influence of alloying additions of molybdenum (5, 10, 20 wt.%) on the structure, stress-strain state, phase composition and size of phase components in alloys of the WC-W2C was investigated. It is found, that the addition of molybdenum in an amount of 5 wt. % leads to increases the microhardness for 30% and wear resistance of relit 2-3 times compared to undoped. The increased molybdenum content in alloys based on WC-W2C changes the phase composition and increases compression stress in the matrix phase W2C and stretching of inclusions WC, (Mo,W)2C and Mo2C. Keywords: cooling rate, directed crystallization, Mo-Si-B, WC-W2C, zone melting, electron beam melting, centrifugal spray.