Mechanical properties of the Ti2AlNb intermetallic: a review

Abstract

Ti2AlNb intermetallics are promising next-generation aerospace materials. Advancement in non-conventional manufacturing methods has made the fabrication of these intermetallics economical. However, post-heat treatments are required to obtain desired mechanical properties, which further depend on the microstructural features of the intermetallics. Extensive studies have been conducted to understand the relation between mechanical behavior and microstructural features of this intermetallic. This review presents the effect of various microstructural features of (a) fully B2 and a2 ? B2, (b) fully lamellar, (c) bimodal lamellar, (d) equiaxed and duplex, and (e) plate-like O phase on room temperature properties, namely strength, ductility, and fracture mechanisms. Moreover, the review emphasizes the special microstructural features that are required to enhance the mechanical properties of the alloy