Composite material based on intermetallic alloy VKNA type reinforced with oxide particles

The technology of obtaining composite material experimental samples based on an intermetallic alloy of VKNA type reinforced with oxide particles in an amount of 2–5 vol % is presented. An intermetallic VKNA-1V alloy containing 80–90 wt % of γ' phase was used as the matrix prototype. Al2O3 particles, as well as complex oxides AI2O3⋅Y2O3, AI2O3⋅Y2O3⋅HfO2, were used as reinforcing particles. Granules of VKNA-1V alloy were obtained by gas atomization at the Hermiga Gas Atomiser. Subsequently, these granules were subjected to mechanical alloying with the aim of introducing particles of the aforementioned compositions of oxides to form a composite mixture corresponding in composition to the desired composite material. Experimental composite material samples with different contents of reinforcing particles were obtained from powder mixtures by spark plasma sintering (SPS) with further hot isostatic pressing (HIP). To study the microstructure of experimental samples, the method of scanning electron microscopy was used. Time to failure of experimental samples sintered by spark plasma combined with HIP was determined at a temperature of 900°С and stress of 50, 45, and 35 MPa. It is shown that to determine the areas of application of the developed composition, the hot isostatic pressing operation is necessary, but not sufficient.