Investigation of microstructure in hot-pressed Nb–23Ti–15Al alloy

Phase transformation in Ti–48Al–6Nb porous alloys and its influence on pore properties

“…In contrast, porous intermetallics with a mixture of metallic and covalent bonds [3] enable their structural applications at room and high temperatures attributed to their good mechanical properties and oxidation/corrosion resistance. For example, more attention has been paid for the high Nb-containing TiAl (NbTiAl) alloys, which possess attractive properties such as high melting points, good oxidation resistance, high specific strengths and modulus due to the high Nb content [4][5][6][7][8][9]. The high Nb-TiAl alloys can also be made into porous structures by the powder metallurgy (PM) method [10] to avoid their poor performance.…”

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

“…Nb-based alloys have high melting temperatures, high strengths and ductilities, but low densities. These properties are enhanced further by adding carbides, oxides and elements such as W, Mo and Ta, which form solid-solutions and precipitate within the matrix (Shi et al , 2015).…”

Investigation on strengthening and toughening mechanisms of Nb-Ti-ZrB2 metal matrix ceramic composites reinforced with in situ niobium and titanium boride

“…Particulate reinforced metal matrix composites (PRMMCs) are being considered as potential materials for aerospace owing to their high wear resistance, good balance between strength and toughness, and low thermal expansion [10]. Moreover, the PRMMCs can be fabricated with near isotropic properties in three orthogonal directions compared with the fiber or filament reinforced composites [11]. Many studies have focused on metal matrix composites reinforced with Nb particles [12,13], but there haven't been any reports on the ceramic particulate reinforced Nb based composites.…”

“…Consequently, ZrB 2 was selected as the reinforced particles and Ti was added into Nb to form the NbTiss solid solution matrix to provide toughness and ductility in this work. As for the processing techniques, hot pressing is a more feasible method for processing refractory Nb-based composites with finer microstructures and better compositional homogeneity than vacuum arc melting or casting [11,21]. During hot-press sintering, the ZrB 2 particles have the possibility of decomposing into Zr and B and then B can react with Nb and Ti to form the in-situ NbB and/or TiB.…”