Effect of aging on structure and properties of quenched alloy based on orthorhombic titanium aluminide Ti2AlNb

A metallographic investigation of the effect of bonding pressure and surface finish on isostatic diffusion bonding of Ti-25Al-10Nb-3Mo-1V

“…When secondary alpha-two goes into solution, lower tensile and creep strength should be expected. In this work the effect of surface finish on bonding behaviour agrees with earlier works [19,20].…”

“…• C but at this temperature, this phase does not go into solution unlike secondary α 2 and during slow cooling, β phase does not transform to secondary α 2 completely which is diffusion controlled process requiring time to complete transformation [18,19]. Atomic flux through α 2 /β interface appears to be not enough to complete β transformation to secondary α 2 , which is merely related to operating temperature and solubility effects [17].…”

“…Having a rich content of Al, α 2 also contains some Nb due to the stabilizing effect from V and Mo additions. However, it also needs the influx of V and Mo in the presence of high amount of Al to supersature α 2 in order to transform to β phase, which is prevented due to the low solubility of Nb [18,19]. It is observed that the volume fraction, and hence the area of secondary α 2 +β matrix is in increase as the surface roughness increases (Table 3).…”

Transformation of Metastable β-Solid Solution in Alloy VTI-4

“…A mechanism of formation of an O-phase from a B2-phase suggested in [5 -8] involves the appearance of an intermediate metastable orthorhombic phase ordered with respect to two elements and having a structure of type B19 (Pmma, AuCd). The stages of the transformation of structure in an alloy based on an O-phase in the course of the a 2 ® O transformation are studied in [9,10].…”

Characterization of Ti-25.5Al-13.5Nb-2.8Mo-1.8Fe Alloy Hot Deformation Behavior Through Processing Map

“…The Ti 2 AlNb-based alloy (Banerjee et al, 1988;Khadzhieva et al, 2014) combines low density, an improved oxidation resistance, and higher fracture toughness compared with the traditional TiAl and NiAl intermetallics (Feng et al, 2002;Yang et al, 2004;Lin et al, 2012). Therefore, Ti 2 AlNb intermetallics have been regarded as promising structural metals to be applied to aircraft engine components (Banerjee, 1997;Germann et al, 2005).…”