METHOD FOR PRODUCING POWDER ALLOY TiNi WITH HIGH LEVEL OF MECHANICAL PROPERTIES Russian patent published in 2017 - IPC B22F3/16 B22F9/18 C22C14/00 C22C19/03 

FIELD: metallurgy.

SUBSTANCE: process comprises hydride-calcium synthesis of powder mixture, its consolidation by pressing and vacuum sintering, followed by thermomechanical treatment. The powder mixture is prepared from Ni or a mixture of Ni and NiO with TiO₂ and calcium hydride, and heat treatment is carried out at 1100-1300°C for at least 6 hours, then the produced powder mixture is treated with water and hydrochloric acid solution, dried and classified. Consolidation of the powder mixture is carried out by pressing with formation of a blank of required shape which is subjected to sintering in vacuum at residual pressure not higher than 10^-4 mm hg at temperature not less than 0.95 of alloy melting temperature for at least 2 hours with formation of residual porosity of not more than 5%. Thermomechanical treatment of the blank is carried out at temperature not higher than 950°C true deformation e≥0.7, wherein e=In(S₁/S₂), where S₁ and S₂ - are initial and final cross-sectional areas of blank deformable material.

EFFECT: produce blanks with shape memory effect, controlled phase and chemical compositions, high strength and ductility characteristics.

2 cl, 3 ex, 12 tbl