Sintered heat treatment hardened titanium-base pseudo-alfa-alloy

FIELD: powder metallurgy, namely sintered titanium base alloys used as constructional materials.

SUBSTANCE: sintered titanium base alloy contains, mass. %: aluminum, 5.5 - 7.0; zirconium, 1.4 -2.5; molybdenum,, 0.5 - 1.8; vanadium,, 0.8 -2.3; titanium, the balance. Alloy is prepared of powder of said content with particle size in range 0.5 - 3.0 micrometers. Structure of particles includes martensite α - phase and ω-phase with coherent dissipation range 300 - 600 Å. Percentage density of alloy - 99.6%. In structure of alloy there is no α2 - phase. Alloy is prepared by compacting under pressure 1200 Mpa, sintering at 1523 K for 3 hours in vacuum 0.0133 Mpa, annealing at 723 - 823 K for 1.5 hours and cooling together with furnace until room temperature.

EFFECT: enhanced mechanical properties of alloy.

 

The invention relates to the field of powder metallurgy, in particular to the development of sintered titanium alloys used as structural materials for General use.

Known sintered alloy of the powder components (molybdenum, vanadium, zirconium, and alloys of titanium with aluminum)having the chemical composition: aluminum 6.0 and 7.0 wt.%; zirconium 1.0 to 2.0 wt.%; molybdenum, 1.0 to 2.0 wt.%; vanadium, 1.0 to 2.0 wt.%; titanium - rest and homogeneous two-phase lamellar structure with the size of the original β-grain 170-200 MK and a relative density of 96 to 98% after pressing a mixture of powders of the components at 900 MPa and sintering at 1400-1430°C for 4 hours (Antsiferov V.N., Ustinov V.V., olasov YG Sintered alloys based on titanium. - M.: metallurgy, 1980. - 464 S.).

The disadvantage cast (deformed and annealed) alloy, which has a similar chemical composition, is that it is only subjected to annealing to relieve work hardening and stabilizing the structure, but at the same time the mechanical properties change it up a little.

As the closest analogue is taken sintered alloy based on titanium containing aluminum, zirconium, molybdenum, vanadium and titanium (A.S. USSR SU 467132, publ. 20.10.1975, IPC From 22 To 14, 1/10, 2 pages). The alloy has the following ratio of components, wt.%: aluminum 2-4; zirconium 2-6; tin 1-2,5; molybdenum 0.5 to 1; vanadium 0.5 to 1; alumina 0,-1; Titan - the rest. The alloy is produced from a mixture of powders of the components by wet mechanical mixing, followed by pressing at specific pressures 7-8 t/cm2and sintering at 1300-1400°C for 3-4 hours in a vacuum of 1·10-4mm Hg Known alloy after sintering is not subjected to a hardening heat treatment and has a fragility that is associated with the formation of α2phase.

The aim of the invention is to provide a sintered alloy based on titanium, having a chemical composition the same as that of the above counterparts, but higher mechanical properties in the hardening heat treatment.

To eliminate the above drawbacks offered sintered from a powder of an alloy based on titanium, having the following chemical composition, wt.%: aluminum 5,5-7,0; zirconium 1,4-2,5; molybdenum 0,5-1,8; vanadium 0,8-2,3; titanium - rest. The alloy obtained from a powder of identical chemical composition, having a particle size of from 0.5 to 3.0 μm; the structure of the particles presents martensitic α-phase and ω-phase with the size of coherent scattering regions 300-600Åthe relative density of the alloy is 99.6%, and the structure is missing α2-phase. The alloy obtained by pressing at a pressure of 1200 MPa, sintering at 1523 K for 3 hours in vacuum 0,0133 MPa and subsequent origami 723-823 To within 1.5 hours and cooling the furnace to room temperature. The resulting alloy has optimum mechanical properties: σin, MPa=1460; δ, %=12; ψ, %=28; andn, kJ=540.

We offer sintered thermally hardened pseudo-α-based alloy titanium has a higher mechanical properties that can be used as construction materials for General use.

Sintered from a powder of an alloy based on titanium containing aluminum, zirconium, molybdenum, vanadium and titanium, characterized in that the alloy has the following chemical composition, wt.%:

Aluminum 5,5-7,0

Zirconium 1,4-2,5

Molybdenum 0,5-1,8

Vanadium 0,8-2,3

Titanium Else

when this alloy obtained from a powder of identical chemical composition, having a particle size of from 0.5 to 3.0 μm, the structure of the particles consists of martensitic αphase I ω-phase with the size of coherent scattering regions 300-600 Åwhile the relative density of the alloy is 99.6%, and the structure is missing α2phase, and the alloy obtained by pressing at a pressure of 1200 MPa, sintering at 1523 K for 3 h in vacuum 0,0133 MPa and subsequent annealing at 723-823 To within 1.5 h and cooling the furnace to room temperature.



 

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