Abstract
The Ti–48Al–6Nb alloy is reinforced by the addition of the AlMo/B4C inoculant powders after high-energy ball milling. The in-situ reactions in TiAl melt lead to the formation of Ti2AlC whiskers and Mo2B5 nanoparticles. Good interface matching between the in-situ phases and the TiAl alloy is observed, which is the key point leading to the uniform distribution of the in-situ phases in the TiAl matrix. On this basis, the grain size and lamellar width of the alloy are significantly refined. The compression and three-point bending tests show that both the strength and toughness are improved. Casting twinning between γ-TiAl lamellas is detected in this study, which could be attributed to the internal stress of the melt TiAl as it solidifies. Multiple strengthening and toughening mechanisms induced by the dual-scaled Ti2AlCw and Mo2B5p are the main reason for the improvement on the mechanical properties.
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