Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α2+ γ) microstructure

Chu, Yudong; Li, Jinshan; Zhao, Fengtong; Tang, Bin; Kou, Hongchao

doi:10.1016/j.matlet.2017.08.131

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…In previous works [23,24], based on the strain rate dependence of flow stress (the double logarithmic relationship between shear modulus compensated peak stress (σ/G) and diffusion compensated strain rate ( . ε/D L ) under different deformation conditions as shown in Figure 2 in Ref.…”

Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

“…ε/D L ) under different deformation conditions as shown in Figure 2 in Ref. [23] and in Figure 6 in Ref. [24], the compression parameters (950-1050 • C and 10 −2 s −1 -10 −4 s −1 ) can be divided into three categories with increasing temperatures and decreasing strain rates: dislocation creep region, transition region and GBS region.…”

Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

“…But, it's hard to avoid randomness in choosing the regions of microstructure to be characterized due to the small scanning area of 100 × 70 μm 2 . Combining with the preliminary flow curves analysis and microstructure characterization via SEM in BSE mode in previous works [23,24] and the above detailed microstructure characterization via EBSD in the present work, it can be therefore concluded that γ phase DRX takes place during the compression deformations throughout the whole conditions whether non-superplastic dislocation creep mechanism dominated (e.g., 1000 °C/10 −2 s −1 ) or superplastic GBS mechanism dominated (e.g., 1050 °C/10 −4 s −1 ). The recrystallized γ grain size decreases with the increasing strain rate and decreasing deformation temperature ( Figure 2).…”

Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

“…However, the pioneering research works regarding isothermal compression deformation of γ-TiAl alloys [13][14][15][16][17] and superplasticity of γ-TiAl alloys via tension deformation [18][19][20][21][22] rarely involve the above issues. Therefore, in previous works [23,24] a deformation mechanism transition from dislocation creep to GBS with increasing deformation temperature and decreasing strain rate was revealed via the investigation of the isothermal compression of a fine-grained high Nb containing TiAl alloy with a (α 2 + γ) microstructure. The results of flow behavior analysis and preliminary microstructure characterization suggested that dislocation creep and GBS contribute independently and additively to the strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution of a High Nb Containing TiAl Alloy with (α2 + γ) Microstructure during Elevated Temperature Deformation

Chu

Zhu

et al. 2018

Metals

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In order to verify the correctness of the transition of deformation mechanism with the change in deformation parameters and to reveal the types and mechanism of dynamic recrystallization of γ grains during compression deformation, microstructure characterization of Ti-43.5Al-8Nb-0.2W-0.2B (at. %) alloy after isothermal compression deformation were performed. When the alloy was deformed at 1000 • C/10 −2 s −1 , the initial γ grains are elongated and significantly refined and the fraction of low angle grain boundaries (LAGB) of γ grains is obviously increased and the texture intensity remains unchanged, which indicates that the compression deformation in dislocation creep region is dominated by intragranular deformation and dynamic recrystallization (DRX) of γ grains. Besides, the lattice rotation at grain boundary serrations may be responsible for the nucleation of new recrystallized γ grains, and the following growth process may be achieved by the migration of γ grain boundaries. However, when the alloy deformed at 1050 • C/10 −4 s −1 and 1000 • C/10 −4 s −1 , the γ grains maintain equiaxed shapes and distribute more uniformly and the fraction of LAGB of γ grains is slightly raised and the texture sharpness decreases, which indicates that the compression deformation in grain boundary sliding (GBS) region is mainly controlled by GBS of γ grains and DRX occurs simultaneously within some coarse γ grains.

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Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

Section: The Effect Of Compression Parameters On Microstructure Evolumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure Evolution of a High Nb Containing TiAl Alloy with (α2 + γ) Microstructure during Elevated Temperature Deformation

Chu

Zhu

et al. 2018

Metals

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Effects of Boron On Microstructure Evolution and Mechanical Properties in Ti46Al8Nb2.6C0.8Ta Alloys

et al. 2019

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To regulate and control microstructure and mechanical properties with the addition of boron, Ti46Al8Nb2.6C0.8TaxB alloys have been produced by casting. Boron content, and its influencing mechanism on the alloy, has been discussed especially in the formation of borides. Experimental results indicate that the content of TiB particles (vol%) increases when the content of boron increases and the B2 phase, in the lamellar colony, disappears. There are three types of boride morphologies discerned in these alloys, which are: granular (C), plate (P), and flake (F) borides. The content of TiB particles (C, vol%) shows a more noticeable increase than in the others. The size of the lamellar colony is refined from 28.4 to 20.8 µm when the content of boron is up to 2.0 at%. Compressive testing indicates that the strength increases from 2191to 2255 MPa and the strain from 26.1 to 28.2% when the content of boron is up to 1.2 at%. Tensile tests reveal that the ultimate strength of the Ti46Al8Nb2.6C0.8Ta0.8B alloy rises from 344to 479 MPa and the corresponding strain rises from 3.9 to 9.1%, when the testing temperature increases from 750to 950 °C. The main reasons for the improved mechanical properties are precipitation strengthening of TiB, disappearance of the B2phase and grain boundary strengthening.

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Gradient Structure of Ti-55531 with Nano-ultrafine Grains Fabricated by Simulation and Suction Casting

Pan

Liu

et al. 2022

J. of Materi Eng and Perform

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Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α2+ γ) microstructure

Cited by 12 publications

References 12 publications

Microstructure Evolution of a High Nb Containing TiAl Alloy with (α2 + γ) Microstructure during Elevated Temperature Deformation

Microstructure Evolution of a High Nb Containing TiAl Alloy with (α2 + γ) Microstructure during Elevated Temperature Deformation

Effects of Boron On Microstructure Evolution and Mechanical Properties in Ti46Al8Nb2.6C0.8Ta Alloys

Gradient Structure of Ti-55531 with Nano-ultrafine Grains Fabricated by Simulation and Suction Casting

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