Abstract
In this study, Nb-27.3Ti–18Al (at.%) alloys with columnar strengthening phases were fabricated by combining spark plasma sintering (SPS) at 1250 °C and 1350 °C and mechanical alloying (MA). Two morphological powders were obtained by the MA process. Powder I was the completely alloyed powder with homogeneous Nb-based solid solution phase (Nbss), and Powder II consisted of elemental lamellae formed by cold welding. Microstructure evolution at different SPS temperatures of two kinds of powders and toughening mechanisms of alloys were analyzed, and the results have shown that Powder II could promote the formation of columnar phase besides sintering temperature. Moreover, after comparison and analysis, grain refinement of SPSed alloy with 27.3 at.% Ti content showed good fracture toughness at 1350 °C, which is better than the previously reported Nb–Ti–Al alloys by hot pressing (HP) and laser forming.
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