METHOD FOR PREPARING ALLOY BILLETS BASED ON TINI INTERMETALLIDE Russian patent published in 2017 - IPC B22F3/16 B22F9/18 C22C14/00 C22C19/03 

FIELD: metallurgy.

SUBSTANCE: method involves preparing a powder mixture of TiO₂, Ni and/or nickel oxide and calcium hydride, heat treating the resulting mixture at a temperature of 1100-1300°C for, at least, 6 hours with the provision of hydride-calcium synthesis of the alloy powder based on the TiNi intermetallide. The resulting alloy powder is treated with water and then with a solution of hydrochloric acid, after which the washed powder is dried and classified. The resulting powder is consolidated by pressing to form a compact of the desired shape, which is sintered in a vacuum at a residual pressure of not higher than 10⁴ mm Hg. at a temperature of not less than 0.95 of the alloy melting temperature for, at least, 2 hours with the formation of a residual porosity of not more than 5%.

EFFECT: production of billets with shape memory effect, minimum porosity, controlled phase and chemical compositions is ensured, and the temperatures of direct and reverse martensitic transformations are reproducible in the resulting alloys.

2 cl, 4 ex, 12 tbl