Superplasticity in a vanadium alloyed gamma plus beta phased TiAl intermetallic

Thermomechanical characterization of β-stabilized Ti–45Al–7Nb–0.4W–0.15B alloy

“…Nieh et al [27] supported this viewpoint and suggested that the role of the b phase is primarily to improve the accommodation of sliding strains at grain triple junctions, thus retarding cavitation and premature fracture formation. Vanderschueren et al [28] argued that the presence of the b phase actually enhances grain boundary cohesion, and thus delays cavitation and fracture processes. All these studies clearly reveal the beneficial effect of the b phase on the ductility of TiAl at elevated temperatures.…”

Development of a Nb-free TiAl-based intermetallics with a low-temperature superplasticity

“…Superplasticity has been observed in some B2-containing TiAl intermetallics, and is partially attributed to: (1) as a lubricant, the grain-boundary B2 phase promotes grain-boundary sliding and grain rotation during superplastic deformation [9]; (2) the presence of the B2 phase, as a cohesion with the grain boundaries, delays the cavitation and fracture processes [10]; (3) the accommodation of sliding strain at grain triple junctions is improved by B2 phase [11]. In this study, TiAl-based intermetallics, with a nominal composition of Ti-45Al-3Fe-2Mo (at.…”

Investigation of interfacial reaction in SiC fiber reinforced Ti–43Al–9V composites

“…In order to reduce cracks, a more plastic matrix is needed, besides of an extra ductile coating [8]. It has been reported that a TiAl intermetallics with high content of V is more ductile [9,10], which is beneficial for processing of the TMCs. For instance, the specific elongation of Tie48Al and Tie50Al is less than 1% [11], while that of Tie43Ale9V alloy can reach 2%e3% [12].…”