Abstract
One binary Ti 48.9Al (at%) alloy and two advanced γ-TiAl based alloys, one with the composition Ti 47Al 4(Nb, Mn, Cr, Si) (at%) and the other with the same composition but with a boron addition, were spray formed at two different melt flow rates using the ‘Electrode Induction Melting Gas Atomization’-technology (EIGA) and a specially designed collector system. In the cylindrically shaped deposits, porosity levels between 1 and 3% were obtained. The microstructures were found to be fine duplex for the boron containing alloy and near lamellar with lamellar colonies smaller than 100 μm for the two other alloys. Upon tensile testing at room temperature all three alloys showed some plastic elongation. The highest yield and ultimate tensile strengths of σ 0.2=609 MPa and σ UTS=658 MPa were obtained for the boron containing Ti 47Al 4(Nb, Mn, Cr, Si) + B alloy.
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