Abstract
The effects of annealing in the α + γ and α2 + γ phase fields on the microstructures and fracture properties of Ti-48A1 and Ti-49Al-3.4Nb are discussed in this article. Annealing of the niobium-containing alloy in the α2 + γ phase field results in the precipitation of ⇌2 and Nb5Si3 predominantly at the grain boundaries. The precipitation decrease the grain boundary cohesion, thereby promoting intergranular separation. Precipitation also decreases the tensile strength and ductility of Ti-49Al-3.4Nb compared to that of the binary alloy. The possible role of interfaces in the transmission of slip is also discussed, and micromechanical models are applied to the prediction of tensile behavior and fracture toughness.
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