A novel method to directional solidification of TiAlNb alloys by mixing binary TiAl ingot and Nb wire

Chen, Ruirun; Fang, Hongyuan; Chai, Dong Liang; Yang, Yaohua; Su, Yanqing; Ding, Hongsheng; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.msea.2017.01.078

Cited by 18 publications

(2 citation statements)

References 30 publications

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“…Since the 70s of last century, researchers have regarded increasing the working temperature and reducing the weight of parts as two important goals for the new high-temperature structural materials [1][2][3][4][5]. Among the intermetallic compounds, TiAl alloys have great potential to be applied to aerospace structural parts due to their high-temperature strength and stiffness higher than that of Ni-based and Ti-based alloys [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Tian,

Yang,

Zhang

et al. 2023

Mater. Res. Express

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The hot deformation behavior of TiAl alloy is analyzed by combining the true stress-strain curve and microstructure analysis. The results show that the flow stress of TiAl alloy presents the characteristics of work hardening-dynamic softening, it increases with the increase of strain rate and decreases with the increase of temperature. Based on the true stress-strain curves, the flow stress of TiAl alloy under different deformation conditions is predicted by hyperbolic sinusoidal formula. In addition, the effects of deformation temperature and strain rate on the microstructure evolution of TiAl alloy are revealed. In the process of hot compression deformation, dynamic recrystallization and γ→α, β→α phase transformation occurs. During tensile deformation, TiAl alloy exhibits super-plasticity, which is mainly due to grain rotation and coordinated deformation of β phase.

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Section: Introductionmentioning

confidence: 99%

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Tian,

Yang,

Zhang

et al. 2023

Mater. Res. Express

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show abstract

“…This increases the yield stress of the material and affects the plasticity to a large extent.In addition, directional solidification technology is also commonly used to prepare eutectic composites to improve the structure and properties of materials. [14][15][16][17] E. Çadirli [18] studied the effect of solidification parameters of directional solidification on Pb-Sn eutectic structure. The results showed that the lamellar spacing decreased gradually with the increase of growth rate, temperature gradient, and cooling rate.…”

mentioning

confidence: 99%

Compressive Property and Toughening Mechanism of Directionally Solidified Fe(Al, Ta)/Fe₂Ta (Al) Eutectic Composites

Liang,

Cui,

et al. 2024

Adv Eng Mater

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In present study Fe(Al, Ta)/Fe2Ta(Al) eutectic composites were prepared using the electron beam floating zone melting directional solidification technique. The compression and fracture toughness properties of Fe(Al, Ta)/Fe2Ta(Al) eutectic composites at different solidification rates were studied with compression and three‐point bending experiments. The toughening mechanism of the material was also analyzed from morphology, composition and microstructure. The results show that the yield strength and compression properties of the Fe(Al, Ta)/Fe2Ta(Al) eutectic composite are increased with the increase of the solidification rate. The room temperature fracture toughness reaches 30.5 MPa·m1/2 when the solidification rate is 4 mm/min. In addition, the material exhibits high strength performance at room temperature. However, it exhibits poor strength and excellent plasticity due to the softening effect of recrystallization at 600°C. The toughening mechanism of the Fe(Al,Ta)/Fe2Ta(Al) eutectic composites can be summarized as crack blunting, crack branching, crack deflection, and local deformation.This article is protected by copyright. All rights reserved.

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O Phase Precipitation and Variant Selection in Ti–22Al–25Nb Alloy during the Hot Shear Spinning

Kou

Tang

et al. 2018

Adv Eng Mater

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O phase precipitation and variant selection in Ti–22Al–25Nb alloy during the hot shear spinning are investigated using scanning electron microscope (SEM), electron backscattered second diffraction (EBSD), and transmission electron microscope (TEM). The results show that the random O phase precipitates from the B2 matrix during the hot shear spinning. With the increase of reduction ratio, the average thickness of O precipitates increases from ≈0.18 to ≈0.50 μm. Meanwhile, the O precipitates show various morphologies, including lamella, short rod, and sphere. Twelve O variants simultaneously form in the parent B2 phase and the orientation relationship between the B2–O phases is confirmed as [−111] B2//[1–10] O and (110) B2//(001) O. Different patterns of dislocation are also found in the B2 matrix, such as dislocation tangles, dislocation nets, and dislocation arrays. They play an important role in the variant selection of O precipitates, resulting in the different angled combinations of O variants. In addition, massive dislocation piles up along the O/B2 interface and some dislocation wall generates within the O phase, which are benefit for the globularization of O precipitates.

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A novel method to directional solidification of TiAlNb alloys by mixing binary TiAl ingot and Nb wire

Cited by 18 publications

References 30 publications

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Compressive Property and Toughening Mechanism of Directionally Solidified Fe(Al, Ta)/Fe₂Ta (Al) Eutectic Composites

O Phase Precipitation and Variant Selection in Ti–22Al–25Nb Alloy during the Hot Shear Spinning

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A novel method to directional solidification of TiAlNb alloys by mixing binary TiAl ingot and Nb wire

Cited by 18 publications

References 30 publications

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Compressive Property and Toughening Mechanism of Directionally Solidified Fe(Al, Ta)/Fe2Ta (Al) Eutectic Composites

O Phase Precipitation and Variant Selection in Ti–22Al–25Nb Alloy during the Hot Shear Spinning

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Product

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Compressive Property and Toughening Mechanism of Directionally Solidified Fe(Al, Ta)/Fe₂Ta (Al) Eutectic Composites