Composite material based on intermetallic alloy VKNA type reinforced with oxide particles
The technology of obtaining of composite material experimental samples based on VKNA type an intermetallic alloy reinforced with oxide particles in an amount of 2 - 5 vol. % is presented. Anintermetallic VKNA-1V alloycontaining the 80 - 90 mas. % of γ′-phase was used as the matrix prototype. Al2O3 particles, as well as complex oxides Al2O3·Y2O3, Al2O3·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 above mentioned oxides compositions to form a composite mixture corresponding in composition to the aimed composite material. Experimental composite material samples with different reinforcing particles contents 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 MPa; 45 MPa and 35 MPa. It is shown that to determine the application areas of the developed composition, the hot isostatic pressing operation is necessary, but not sufficient.