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- W4313256147 abstract "In recent years, additive manufacturing of titanium aluminide has become an attractive research area. In order to improve microstructure and mechanical properties, element additions to additive manufacturing fabricated titanium aluminide have been continuously a concern. In the present research, vanadium has been successfully introduced into γ-TiAl alloy using twin-wire directed energy deposition-arc (TW-DED-arc) method, which aims to improve strength and plasticity of as-deposited TiAl component. A throughout research on microstructure, chemical composition homogeneity and mechanical properties of TW-DED-arc deposited Ti-48Al and Ti-48Al-2V alloys is investigated. The experiment results show that as-fabricated γ-TiAl alloys possess layered fully lamellar microstructure consisting of columnar and equiaxed grains. Vanadium exhibits neither positive nor negative segregation during solidification process of TW-DED-arc but partitions to α2 phase in as-deposited Ti-48Al-2 V alloy. As a β-stabilizing and solid-solution element of γ-TiAl intermetallic, vanadium additions cause increase of α2 phase content, decrease of lamellar spacing and γ phase lattice contraction of TW-DED-arc fabricated TiAl alloy. Moreover, introduction of vanadium is capable of enhancing tensile properties under both room temperature and high temperature, with ∼ 35% improvement in tensile strength and ∼ 65% improvement in elongation. Importantly, microstructural effects and strengthening mechanism of vanadium additions are investigated in detail. Generally, the findings provide a valuable reference for alloying element additions to additively manufactured TiAl alloy." @default.
- W4313256147 created "2023-01-06" @default.
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- W4313256147 date "2023-01-01" @default.
- W4313256147 modified "2023-10-12" @default.
- W4313256147 title "The effect of vanadium on the microstructure and mechanical properties of TiAl alloy fabricated by twin-wire directed energy deposition-arc" @default.
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- W4313256147 doi "https://doi.org/10.1016/j.addma.2022.103382" @default.
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