Investigation of flow behavior and microstructure of Ti–6Al–4V with annealing treatment during superplastic forming

Yang, Junzhou; Wu, Jianjun; Zhang, Qianwen; Han, Ruolan; Wang, Kaiwei

doi:10.1016/j.msea.2020.140046

Cited by 23 publications

(4 citation statements)

References 39 publications

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“…Great ductility can also be obtained in some ceramics and geological materials [7]. Although some attempts have been tried to optimize the SPF process windows by changing the metallography structures of materials [8][9][10][11], the current mainstream view still holds that the superplasticity of metals needs two compulsory requirements: a high temperatures and certain strain rate regions [5]. For the Ti-6Al-4V alloy, the elevated temperatures are at about 900 • C and the controlled strain rates need to be within the range of 10 −4 to 10 −2 /s.…”

Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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An investigation of flow behavior and the deformation mechanism for Ti-6Al-4V alloy during the superplastic deformation process is presented in this paper. Constant strain rate tensile tests were performed at 890–950 °C and strain rates of 10−2, 10−3, and 10−4/s. Then, surface observation by Optical Microscope (OM), Scanning Electron Microscopy (SEM), and Electron Back-scattered Diffraction (EBSD) was applied to obtain the microstructure mechanism. With pole figure maps (PF) for α-phase, obvious texture gradually changed in the main deformation direction. For the titanium alloy, the evolution of texture in deformed samples was attributed to grain rotation (GR). Significant grain rearrangement occurred between grains after deformation. A complete grain rotation accommodated grain boundary sliding (GBS) deformation mechanism is proposed, which can explain texture evolution without grain deformation.

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Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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“…Diffusion bonding involves complex boundary migration and plastic deformation [8][9][10][11]. While most works currently focused on the superplasticity of steels and ferrous alloys [12][13][14][15], very limited research has investigated the diffusion bonding process [16][17][18]. The microstructure evolutions during the DB would certainly determine the mechanical behaviors of the formed parts [19]; thus, the purpose of this study was to explore the effect of initial materials on the bonding joints microstructures.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Zhang

Jiang

et al. 2022

Metals

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Superplastic forming and diffusion bonding (SPF/DB) has been recognized as a viable manufacturing technology. However, the basic understanding of grain size and its effects on the quality of diffusion bonds is still limited. In this study, a certain type of SP700 alloy with different grain sizes is bonded at superplastic temperature. The experimental results indicate that the same materials, if coarse-grained, may not readily bond under identical conditions of pressure, temperature, and time. This type of bonding is possible because of the presence of many grain boundaries in fine-grained materials that act as short-circuit paths for diffusion. In addition, grain-boundary migration is also faster in fine-grained than in coarse-grained materials. Fractographic studies show that the dimples on the coarse-grained specimen have large dimensions compared with that in the fine-grained material, indicating that heterogeneous deformation develops in the coarse-grained specimen during tension.

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“…Titanium alloys have been widely used in the aerospace, automobile, chemical and other industries due to its desirable properties of higher strength, ductility and superplasticity, in which, SP700 alloy (a kind of excellent β-rich α + β titanium alloy) is attracting increasing attention for its excellent superplasticity [1][2][3][4][5][6]. Superplasticity refers to the capability of high tensile elongation before failure of polycrystalline materials, which is usually characterized by low flow stress and high plastic strain.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Slow Eutectoid Element on Tensile Properties and Superplasticity of a Forged SP700 Titanium Alloy

Han

Zhang

Zeng

et al. 2021

Metals

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The tensile properties and superplasticity of a forged SP700 alloy with slow eutectoid element (1.5%Cr) addition were investigated in the present paper. The results of the microstructures showed that slow eutectoid element Cr has a significant influence on stabilizing the β phase and the SP700Cr alloy showed a uniform duplex and completely globular microstructure after annealing at 820 °C for 1 h and aging at 500 °C for 6 h. The results of the tensile tests showed that the yield strength, ultimate tensile strength and elongation of the alloy with optimized microstructure were 1312 MPa, 1211 MPa and 10% at room temperature, and the elongation was achieved to 1127% at 770 °C. Compared with that of the SP700 alloy, the strain rate sensitivity of the SP700Cr alloy showed a higher value. The microstructures after elevated temperature tensile tests showed that the higher density of dislocations and twins exists in SP700 alloy and the lower density of dislocations favor distribution in SP700Cr alloy. Based on the above results, the tensile properties and superplasticity of the forged SP700 alloy with 1.5% Cr addition was analyzed. In addition, microstructure characteristics were investigated by the TEM and EBSD technologies.

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Investigation of flow behavior and microstructure of Ti–6Al–4V with annealing treatment during superplastic forming

Cited by 23 publications

References 39 publications

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Investigation of Slow Eutectoid Element on Tensile Properties and Superplasticity of a Forged SP700 Titanium Alloy

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