METHOD OF MAKING FOIL FROM TITANIUM-BASED INTERMETALLIDE ORTHOALLOYS Russian patent published in 2012 - IPC B21B3/00 

FIELD: process engineering.

SUBSTANCE: proposed method comprises making ingots or powder billets. The latter are subjected to hot thermo mechanical machining, including sandwich rolling and finish cold rolling. Foil material mechanical properties are stabilised and material structure is blended in sandwich rolling at semi-finished rolled stock thickness of 2-4 mm with premade fine structure wherein grain width does not exceed 10 mcm while its length makes 40 mcm. Sandwich is composed of a set of semi-finished rolled billet and two steel covering plates. Note here that top covering plate thickness is 1.4-1.8 times larger than that of bottom plate. Hot rolling of sandwich is started from 950±50°C in several passes with total deformation of 70-90%. After annealing at 920±70°C and sandwich disassembly, cold rolling of every billet is performed at total deformation of 40-70% with intermediate vacuum annealing at 920±70°C.

EFFECT: higher foil quality made from titanium aluminide-based alloys based on Ti₂AlNb orthorhombic phase.

2 cl, 4 dwg, 2 tbl