Mater.Phys.Mech.(MPM)
No 1, Vol. 33, 2017, pages 12-18

Ti2AlNb-BASED INTERMETALLIC ALLOYS AND COMPOSITES

M.R Shagiev, R.M. Galeyev, O.R. Valiakhmetov

Abstract

Optimization of the chemical composition of Ti2AlNb-based alloy resulted in development of high-strength Ti-20.3Al-22.1Nb-1.2Zr-1.3V-0.9Mo-0.3Si (at.%) intermetallic with rather low density ρ5.1 g/cm3. Mechanical properties of the alloy were considerably improved due to formation of the homogeneous ultrafine-grained structure. The ultrafinegrained material exhibited both high strength and ductility at room temperature (σUTS=1400 MPa; δ=25%) and superplastic behavior in the temperature range of 850-1000C ( δmax=930% at T=900C). The metal-intermetallic composites consisting of alternating layers of the orthorhombic intermetallic alloy and the commercial high-temperature titanium alloy were produced. The 3-layered composite had high strength and reasonable ductility both at room and elevated temperatures: σUTS=1235 MPa and δ=4% at T=20C; σUTS=875 MPa and δ=21% at T=600C.

Keywords: intermetallic Ti2AlNb-based alloy, ultrafine-grained material, mechanical properties, metal/intermetallic composite.

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