The invention relates to a preparation method of high NbTiAl alloy with nano-yttrium oxide, which is characterized by the mole percentage content of the alloy components: 45% ~ 48% Al, 6% ~ 10% Nb, 2.5% ~ 3.5% V, 0.05% ~ 3% nano-Y-2O-3 and the remaining Ti. The method is carried out according to the following steps: one, cleaning: titanium rod, sponge titanium, high purity aluminum, aluminum niobium intermediate alloy and aluminum vanadium intermediate alloy oxide skin removal, ultrasonic cleaning in alcohol, blow dry; 2. Weighing material: nano-Y-2O-3 powder, titanium rod, sponge titanium, high purity aluminum, aluminium-niobium intermediate alloy and aluminium-vanadium intermediate alloy after the treatment of step 1 are weighed, and nano-Y-2O-3 powder is pressed into multiple yttrium oxide prefabricated blocks; Alternatively, nano-Y-2O-3 powder, dispersed metal powder, titanium rod, sponge titanium, high purity aluminum, aluminium-niobium intermediate alloy and aluminium-vanadium intermediate alloy after the treatment of step 1 are taken. Nano-y-2o-3 powder and dispersed metal powder are mixed evenly and pressed into several yttrium oxide prefabricated blocks. The dispersed metal powder is one of titanium powder, aluminum powder, niobium powder and vanadium powder or a mixture of several of them. Three, pressing block: the sponge titanium, aluminium-niobium intermediate alloy, aluminium-vanadium intermediate alloy and high purity aluminum are weighed in step two, and a number of alloy blocks are made. The alloy blocks are sponge titanium layer, aluminium-niobium intermediate alloy layer, aluminium-vanadium intermediate alloy layer, high purity aluminum layer and sponge titanium layer from bottom to top.
Smelting: (1) Put the titanium rod weighed in Step 2, the yttrium oxide prefabricated block prepared in Step 2 and the alloy block prepared in Step 3 into a drying box for preheating; (2) Put the titanium rod vertically into the copper crucible of the water-cooled copper crucible vacuum induction melting furnace, place the alloy block material evenly around the titanium rod, close the door of the water-cooled copper crucible vacuum induction melting furnace; (3) Vacuumize the water-cooled copper crucible vacuum induction melting furnace to below 5Pa, and then fill it with argon until the pressure is 800Pa; ④ Repeat step ③ for 1 ~ 3 times, then load the power to 20kW ~ 40kW, keep it for 5min ~ 10min, then load the power to 60kW ~ 70kW at the speed of 5kW/min ~ 10kW/min, until all the materials in the water-cooled copper crucible vacuum induction melting furnace melt, and continue at the power of 60kW ~ 70 Then add the yttrium oxide prefabricated block prepared in Step 2 through the secondary feeding hopper. Then load the power at the speed of 10kW/min ~ 20kW/min to the power of 80kW ~ 90kW, and hold the alloy melt for 3min ~ 7min under the power of 80kW ~ 90kW, and crucible the copper The alloy melt was poured into the steel mold in the water-cooled copper crucible vacuum induction melting furnace for 0.5 ~ 1min after the melting pot was turned over 160°, and then argon gas was filled into the water-cooled copper crucible vacuum induction melting furnace. The alloy ingot in the steel mold was taken out after opening the water-cooled copper crucible vacuum induction melting furnace, and the as-cast high NB-tial alloy material was obtained. 5. Heat treatment: The as-cast high Nb-tial alloy obtained in Step 4 is homogenized and annealed at 900 ~ 1200℃ to obtain a high Nb-Tial alloy with nano-yttrium oxide.
