Introduction of ternary alloying element in wire arc additive manufacturing of titanium aluminide intermetallic

摘要: Abstract In order to introduce vanadium as a ternary alloying element during the wire arc additive manufacturing (WAAM) of titanium aluminide intermetallic alloys, alloy and elemental consumables (Ti6Al4V Al wires, respectively) were used with WAAM process. A crack-free TiAl bulk nominal chemical composition Ti45Al2.2 V was successfully fabricated for first time through dynamic in situ using method. The experimental results showed that introduction V from Ti6Al4V does not change flat features lamellar interface also alter phase resultant alloy. consists colonies γ interdendritic top region, fully structure unclear grain boundaries band regions large equiaxed α2 fine laths precipitated at layers. microhardness tensile properties greatly increased by introducing due general absence ductilization effect. addition, influences two-step post-heat treatments on microstructure mechanical are analysed. Results indicate can be considerably modified after applying different solution treatment temperatures.