MONOCRYSTALLINE MATERIAL OF INTERMETALLIC COMPOUND OF TITANIUM AND ALUMINIUM AND METHODS FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C22C14/00 C30B29/52 C30B11/00 C30B21/04 C30B13/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to intermetallic alloys of titanium and aluminium, and can be used for production of parts of aircrafts and vehicles. Monocrystalline intermetallic alloy of titanium and aluminium has composition, at. %: Ti_aAl_bNb_c(C, Si)_d, where 43≤b≤49, 3 <c≤10, 0.1≤d≤1, a + b + c + d = 100 at. %. Method of producing single-crystal intermetallic alloy of titanium and aluminium involves mixing initial components of alloy, melting in cold crucible of induction levitation furnace in vacuum 10^-3 Pa or lower to produce ingots of intermediate alloy and subsequent gravitational casting or casting by vacuum suction to produce bars from intermediate alloy, cutting the obtained rods on upper and lower rods for use as initial material of rods and bars of seed crystals for optical zone melting in a furnace of directed crystallisation, arrangement of said rods aligned and that they are perpendicular to horizontal plane, rotation of upper and lower rods in opposite directions with relative rotation speed of 10–40 rpm, initiation of heating for melting of opposite ends of upper and lower bars with provision of gradual approach and connection of opposite ends to each other. Power of equipment is controlled and maintained for 5–10 minutes, and then adjusting the growth rate to 2.5–30 mm/h. After completion of crystallization, the crystallized rods are separated from the monocrystalline titanium and aluminium alloy from the bars of the seed crystals, vacuum heat treatment is performed by cooling in a furnace or in air at temperature of 1250–1350 °C for 12–24 hours and then at temperature of 900 °C for 30 minutes.

EFFECT: alloy is characterized by high strength and plasticity.

8 cl, 17 dwg, 2 tbl, 23 ex