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- W4212888900 abstract "Attributing to the fast solidification and thermal cycling during additive manufacturing process, massive phase transformation could take place thus leading to the formation of unpredictable microstructures with large variation in mechanical properties. In this paper, a continuous direct energy deposition technique (CDED) is adopted to prepare TiAl alloy seceding from the thermal cycling, and the evolution of microstructure, microhardness and tensile properties of alloy are investigated. Results indicate that the microstructure of alloy composes of columnar grains with very fine (α2 +γ) lamellae, and no heat-affect band is observed. A heat transfer model is established to assist in explaining the solid-phase transformation and microstructure formation mechanism of TiAl alloy. Furthermore, a special duplex γ microstructure (DP γ) forms which composes of massive γ phase surrounded by feathery-like γ phase. By dissecting crystallographic orientation from EBSD results, the formation mechanism of DP γ is clarified as the result of sequential solid-state phase transition in (α + γ) phase region, in which the feathery-like microstructure forms firstly followed by the massive γ phases nucleating at the inter-phase boundaries of feathery-like γ. Tensile property of as-deposited alloy reveals of 535 MPa with 1% elongation, and the highest hardness of around 320HV is detected at the top region of alloy with the finest interlamellar spacing." @default.
- W4212888900 created "2022-02-24" @default.
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- W4212888900 date "2022-06-01" @default.
- W4212888900 modified "2023-10-14" @default.
- W4212888900 title "Microstructure evolution and tensile property of TiAl alloy using continuous direct energy deposition technique" @default.
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- W4212888900 doi "https://doi.org/10.1016/j.jallcom.2022.164309" @default.
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