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| Home > Publications database > A dilatometer and in situ synchrotron X-ray diffraction study: $α$-quenching and reheating of a Nb-rich titanium aluminide alloy |
| Home > Publications database > A dilatometer and in situ synchrotron X-ray diffraction study: $α$-quenching and reheating of a Nb-rich titanium aluminide alloy |
| Journal Article | PUBDB-2025-05320 |
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2025
Springer Nature Switzerland AG
Cham
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Please use a persistent id in citations: doi:10.1557/s43580-025-01382-w doi:10.3204/PUBDB-2025-05320
Abstract: Intermetallic γ-TiAl-based alloys are currently used as structural materials for turbine blades in aero engines. Additive manufacturing is increasingly considered as an additional manufacturing route for components consisting of γ titanium aluminides; however, the high heating and cooling rates result in chemical and thermodynamical disequilibrated microstructures. In our study, in situ synchrotron X-ray diffraction was applied to follow the formation of the disequilibrium microstructure during quenching and to study its re-equilibration during a subsequent annealing treatment in a Nb-rich γ-TiAl-based alloy. The quenched sample showed an incomplete massive transformation, with large remaining α2 grains. During reheating, the analysis of the collected data showed that equilibration of the quenched microstructure takes place in several reordering and transformation steps, e.g., orthorhombic distortion of the hexagonal α2 phase (around 550 °C), almost complete transformation of the supersaturated quenched α2 to γ (around 850 °C), and retransformation of γ to new α2 (around 1050 °C).
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