Low-Temperature Superplasticity and Deformation Mechanism of Ti-6Al-4V Alloy

Zhou, Ge; Chen, Lijia; Liu, Lirong; Liu, Haijian; Peng, Heli; Zhong, Yiping

doi:10.3390/ma11071212

Cited by 12 publications

(10 citation statements)

References 26 publications

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“…Hence, the deformation mechanism, accommodation mechanism, and ratecontrolling mechanism are important in the fine-grained material. Zhou et al [38] observed low-temperature superplasticity in 6 μm grain-sized Ti-6Al-4 V alloy at 700°C due to GBS accommodated by slip. However, the accommodation mechanism becomes grain boundary diffusion on increasing the temperature to 850°C.…”

Section: Fine-grained Superplasticitymentioning

confidence: 99%

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

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The superplastic deformation exhibited by metals with different grain sizes and their corresponding deformation mechanism influences the industrial metalforming processes. The coarse-grained materials, which contain grain size greater than 20 μm, exhibited superplastic deformation at high homologous temperature and low strain rate of the order of 10 −4 s −1. Fine grain materials (1-20 μm) are generally considered as favorable for superplastic deformation. They possess highstrain-rate sensitivity "m" value, approximately, equal to 0.5 at the temperature of 0.5 times the melting point and at a strain rate of 10 −3 to 10 −4 s −1. Ultrafine grains (100 nm to less than 1 μm) exhibit superplasticity at high strain rate as well as at low temperature when compared to fine grain materials. It is attributed to the fact that both temperature and strain rates are inversely proportional to the grain size in Arrhenius-type superplastic constitute equation. The superplastic phenomenon with nano-sized grains (10 nm to less than 100 nm) is quite different from their higher-scale counterparts. It exhibits high ductility with high strength. Materials with mixed grain size distribution (bimodal or layered) are found to exhibit superior superplasticity when compared to the homogeneous grain-sized material. The deformation mechanisms governing these superplastic deformations with different scale grain size microstructures are discussed in this chapter.

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Section: Fine-grained Superplasticitymentioning

confidence: 99%

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

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show abstract

“…This regime also provided an increased efficiency and a good superplasticity. Fine, equiaxed and stable grain structure with increased temperature simplify the grain boundary sliding and its accommodation by dislocation and diffusion creep which are the superplastic deformation mechanisms [5,[44][45][46]. Low strain rate of 2×10 −4 s −1 at 87°C led to significant dynamic grain growth, thereby resulting in an unstable flow and a low efficiency value.…”

Section: Processing Map Analysismentioning

confidence: 99%

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

Mosleh

Mikhaylovskaya

Котов

et al. 2019

Mater. Res. Express

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This paper studies the superplasticity of conventional sheets of Ti-1V-4Al-3Mo (α+β) alloy. The flow behavior was investigated in a temperature range of 775 °C-900 °C and a constant strain rate range of 2×10 −4-5×10 −3 s −1 via uniaxial tensile tests. The microstructure evolution during the superplastic deformation was analyzed. The results revealed that, the flow behavior of Ti-1V-4Al-3Mo (α+β) alloy is characterized by strain softening phenomena. The experimental stress-strain data were used to build a power law constitutive model. A processing map, which shows the safe and unsafe regions of deformation, was also constructed for the studied alloy. The optimal deformation regime was attained at a temperature of 875 °C and strain rate of 1×10 −3 s −1 which provided a β phase fraction of 52%. Equiaxed fine-grained α and β structure with size of 2-3 μm as well as dislocation activity inside the α-grains were identified in the optimum deformation regime.

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“…The performance parameters of the TC4 matrix, TiB whiskers and the damage evolution parameters of Tsai-Wu failure criterion are shown in Table 1 [16,17,18].…”

Section: Finite Element Analysis Of Tibw/tc4 Compositesmentioning

confidence: 99%

Research on Microscopic Properties of TiBw/TC4 Composites for Drilling Process

et al. 2019

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TiB-whisker-reinforced TiBw/TC4 composites are widely used in aviation, aerospace, automotive, and various other industries. However, the drilling force and temperature have a large effect on the drilling micromechanical properties of TiBw/TC4 composites. In order to explore the micro-mechanical properties and promote the optimization of drilling process, the representative volume elements of TiBW/TC4 composites were established in the Digimat-FE software tool to determine the micromechanical properties and failure mechanism of TiBW/TC4 composites. The results show: (1) maximum stress occurs at the whiskers, whereas the minimum stress appears within the basket matrix region of the reinforced phase. (2) When the force reached 300 N and the temperature reached 75 °C, the junction between the whiskers and the matrix firstly failed; when the force reached 525 N and the temperature reached 112 °C, the matrix began to fail; when the force reached 675 N and the temperature reached 138 °C, the whiskers failed. (3) The main reason for the failure of the junction between the matrix and the whiskers was that the shear stress exceeded the connection strength and the axial stress accelerated the failure process. Displacement and rotation of the whiskers were shown to occur at the moment of junction failure, owing to differences in the stress experienced on different sides of the material.

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Low-Temperature Superplasticity and Deformation Mechanism of Ti-6Al-4V Alloy

Cited by 12 publications

References 26 publications

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

Research on Microscopic Properties of TiBw/TC4 Composites for Drilling Process

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