Evolution of microstructure in niobium rich (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi>α</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mo>+</mml:mo><mml:mi>γ</mml:mi></mml:mrow></mml:math>) based titanium aluminide alloy during hot compression

Singh, Bhavanish Kumar; Kumar, V. Anil; Gupta, Rohit; Kanjarla, Anand K.

doi:10.1016/j.msea.2019.03.111

Cited by 18 publications

(3 citation statements)

References 28 publications

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“…In recent years, there has been extensive research on the microstructure evolution and slip deformation mechanisms of titanium alloys during deformation [11][12][13][14][15][16]. Researchers have found that due to the HCP structure of α grains, prismatic slip and basal slip systems are more likely to be activated than pyramidal <c+a> slip systems during the hot compression process, which will lead to the development of a texture with specific orientations (particularly with respect to the c-axis//TD texture during the plate rolling processes [7,17,18]).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Crystallographic Orientation and Texture Evolution of Ti60 Alloy during Plane Strain Compression

Dai,

Xiao,

Zeng

et al. 2024

Metals

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The crystallographic orientation and texture evolution mechanism of equiaxed Ti60 alloy plates were investigated in this study through plane strain compression tests. The EBSD analysis revealed that the received plate contained two characteristic textures that were perpendicular to each other, i.e., c-axis//TD (Component 1) and c-axis//RD (Component 2), with the latter being caused by the change in direction of the TD texture that was generated during the previous unidirectional rolling process into an RD direction in the cross-rolling process. The results demonstrated that, with increasing the deformation temperature from 930 °C to 960 °C and 990 °C, the intensity of the c-axis//TD texture (Component 1) initially rose to a peak value of 5.07, which then—subsequently—decreased significantly to 2.96 at 960 °C and 3.11 at 990 °C. Conversely, the intensity of the c-axis//RD texture (Component 2) remained relatively unchanged. These texture changes were correlated with slip system activity and the spheroidization of the primary alpha phase. For the c-axis//TD texture, the initial intensity of the texture components during compression at lower temperatures could be attributed to the incomplete dynamic spheroidization process of the α phase, which leads to the reinforcement of the c-axis//TD due to prismatic slip. As the deformation temperature increased, the dynamic spheroidization process became more prominent, thereby leading to a significant reduction in the intensity of the c-axis//TD texture. In contrast, the c-axis//RD texture exhibited difficulty in activating the prismatic slip and basal slip; in addition, it also encountered resistance to dynamic spheroidization, thus resulting in negligible changes in the texture intensity.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Crystallographic Orientation and Texture Evolution of Ti60 Alloy during Plane Strain Compression

Dai,

Xiao,

Zeng

et al. 2024

Metals

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“…Wan [15] discovered that discontinuous dynamic recrystallisation (DRX) was the major hot deformation mechanism. But there is no in-depth discussion of DRX behaviour, and the DRX behaviour is found to be important during thermal deformation [16,17]. Xiang [18,19] systematically studied DRX behaviour, it indicates that DRX preferentially occurred at the lamellar cluster boundaries and the DRX grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Study on microstructure evolution and deformation softening mechanism of a Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy

Lin

Huang

Yuan

et al. 2022

Materials Science and Technology

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The hot compression tests of Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy were achieved by a Gleeble thermal simulator. The results show that the residual lamellar microstructure has sufficient energy and sufficient time to decompose, which is conducive to the evolution of the dynamic recrystallisation (DRX) microstructure. The dislocation density decreases significantly owing to the generation of a DRX. The deformation mechanism during hot deformation is dominated by the DRX of the γ-phase. Meantime, the increment of dislocations will induce to the generation of sub-grain boundaries. In addition to the mechanism of dislocation-induced recrystallised grain formation, twinning deformation is also a typical deformation mechanism in TiAl alloy. The transformation of lamellar microstructure into uniform and fine DRX microstructure can improve the microstructural uniformity of the alloy.

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“…Accordingly, constitutive model which is characterized by accurate evaluation of the instantaneous responses of metals during hot deformation is requisite for the investigation of deformation behavior and numerical simulation. Currently, considerable research attempts have focused on the hot deformation behavior of PM near‐lamellar and near‐gamma TiAl alloys 7,17–20 . However, there is no available information in literature about the investigation of hot deformation behaviors of PM duplex TiAl alloy.…”

Section: Introductionmentioning

confidence: 99%

Hot deformation and dynamic recrystallization behavior of a powder metallurgy Ti‐45Al‐6Nb‐0.3W alloy

Yang

Liu

et al. 2021

Mat Design & Process Comms

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The flow behaviors of powder metallurgy (PM) Ti‐45Al‐6Nb‐0.3W (at.%) alloy were systematically investigated in the temperature range from1050 to 1200°Cand the strain rates from 0.001 to 0.5 s−1. The effects of the temperature and the strain rate on deformation behaviors were represented by Zener–Hollomon parameter in an exponent‐type equation. Microstructural observations revealed that α2/γ lamellar colonies varied into particle α2 due to dynamic recrystallization (DRX) at high temperature during the compression. The result indicated that the strain‐dependent constitutive equation could lead to a good agreement between the calculated and measured flow stresses in the elevated temperature range for the PM Ti‐45Al‐6Nb‐0.3W alloy. Subsequently, the correlation coefficient (R) and the average absolute relative error (AARE) were introduced to verify the validity of the constitutive equation, and values of R and AARE were 0.99483 and 3.956%, respectively.

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Evolution of microstructure in niobium rich (α2+γ) based titanium aluminide alloy during hot compression

Cited by 18 publications

References 28 publications

Mechanism of Crystallographic Orientation and Texture Evolution of Ti60 Alloy during Plane Strain Compression

Mechanism of Crystallographic Orientation and Texture Evolution of Ti60 Alloy during Plane Strain Compression

Study on microstructure evolution and deformation softening mechanism of a Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy

Hot deformation and dynamic recrystallization behavior of a powder metallurgy Ti‐45Al‐6Nb‐0.3W alloy

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