A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Gu, Xiaofeng; Jiang, Sida; Cao, Fuyang; Zhang, Guoqing; Yang, Dongye; Guo, Shu; Song, Heqian; Sun, Jianfei

doi:10.1016/j.scriptamat.2020.10.010

Cited by 40 publications

(4 citation statements)

References 30 publications

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“…The fine YAl 2 particles are distributed at the grain boundary, thus inhibiting grain growth and refining the grains. Besides, they can pin the dislocations during deformation, playing a strengthening role [17].…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…As illustrated by Chen et al [9] in an earlier work, Ti-43Al-V plate was rolled using canned forging and rolling technology. Rare Earth elements such as Y, La, Ru, etc are used for grain refinement and mechanical property improvement: e.g., Ru improves the strength and ductility simultaneously through solid solution strengthening and refinement strengthening [15,16]. Refining grains and lamellae is promoted by Y addition, and uniform distribution of Nb, Mo and the breaking Y compounds might be profitable to prevent oxidation of TiAl alloy, which lead to an improved hot deformability of a Ti-45Al-5Nb-0.3Y alloy [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Rare Earth elements such as Y, La, Ru, etc are used for grain refinement and mechanical property improvement: e.g., Ru improves the strength and ductility simultaneously through solid solution strengthening and refinement strengthening [15,16]. Refining grains and lamellae is promoted by Y addition, and uniform distribution of Nb, Mo and the breaking Y compounds might be profitable to prevent oxidation of TiAl alloy, which lead to an improved hot deformability of a Ti-45Al-5Nb-0.3Y alloy [17][18][19]. Minor La and Ce addition has a refinement on the microstructure of TiA1 alloys, which presents in the TiAl alloy dominantly in the form of Al-RE constituents uniformly distributed in grain boundaries in the shape of discontinuous network.…”

Section: Introductionmentioning

confidence: 99%

A study on the hot workability of a novel TNM-RE alloy (RE = Y, La, Ce)

Chen

Ma²,

Xing³

et al. 2023

Mater. Res. Express

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The hot deformation behavior of a novel TNM-RE alloy (RE=Y,La,Ce) was studied using a hot simulation machine (Gleeble-3800), and microstructural evolution was also characterized. Finally, 3D forging was carried out on isothermal forging equipment. It is shown that the as-cast lamellar colony size is about 20~30 μm, which is refined by the formation of rare earth oxides and borides at grain boundaries inhibiting grain growth. The peak stress of the TNM-RE alloy deformed at 1200 ℃/0.01s-1 is about 97 MPa, which is governed by the lamellar colony size and the B2 phase. Based on microstructure observation, it is found that the lamellar is bent and elongated to coordinate plastic deformation, where dynamic recrystallization nucleates preferentially, and full dynamic recrystallization is obtained at 1220 ℃/0.01s-1. The TNM-RE alloy was forged by 3D isothermal forging method, and fine grains with a size of 10~20 μm were obtained by controlling the process parameters. The novel TNM-RE alloy shows an excellent hot workability.

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“…TiAl alloys are of great interest in high-temperature applications due to their low density, high specific strength, oxidation resistance, and good structural stability at high temperatures [1,2]. In recent years, research has shifted toward high-Nb TiAl alloys due to their higher service temperatures, which makes them attractive for replacing some Nibased superalloys in applications such as gas turbine engines [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Deformation and Phase Transformation of Disordered α Phase in the (α + γ) Two-Phase Region of a High-Nb TiAl Alloy

Zhou

Kong

et al. 2021

Materials

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In this paper, the deformation and phase transformation of disordered α phase in the (α + γ) two-phase region in as-forged Ti-44Al-8Nb-(W, B, Y) alloy were investigated by hot-compression and hot-packed rolling. The detailed microstructural evolution demonstrated that the deformed microstructure was significantly affected by the deformation conditions, and the microstructure differences were mainly due to the use of a lower temperature and strain rate. Finer α grains were formed by the continuous dynamic recrystallization of α lamellae and α grains distributed around lamellar colonies. Moreover, the grooved γ grains formed by the phase transformation from α lamellae during hot rolling cooperated with and decomposed α lamellae. A microstructure evolution model was built for the TiAl alloy at 1250 °C during hot rolling.

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A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Cited by 40 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

A study on the hot workability of a novel TNM-RE alloy (RE = Y, La, Ce)

Deformation and Phase Transformation of Disordered α Phase in the (α + γ) Two-Phase Region of a High-Nb TiAl Alloy

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