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Enhancing high-temperature strength in high-Nb TiAl alloys via C alloying
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DOI：10.1016/j.scriptamat.2026.117382.png)
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Abstract
En 中文
This study investigates the effects of C alloying below and near the solid-solubility limit on the microstructure, high-temperature tensile properties, and deformation behavior of high-Nb TiAl alloys. The results indicate that C acts as a potent α-phase stabilizer, and the resulting solid-solution strengthening is primarily responsible for the enhanced high-temperature strength of the alloy. The addition of C significantly improves high-temperature strength at the expense of ductility. Dislocation slip and twinning serve as the dominant plastic deformation mechanisms of the alloy, while dynamic recrystallization, acting as a microstructural softening mechanism, is progressively suppressed with increasing C content. When the C content reaches 0.7%, nano-sized Ti3AlC precipitates along lamellar colony boundaries and equiaxed γ grain boundaries, which significantly refines the lamellar colony size. These findings provide valuable insights for the design and development of TiAl alloys for high-temperature applications.
Keywords:
C alloying
high-Nb TiAl alloys
microstructure
high-temperature tensile properties
deformation behavior
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5.6
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1.6W
Citations:
5.1W
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