Low-temperature superplastic behavior of beta titanium alloy

Du, Zhongjie; Liu, Jingshun; Li, Guowei; Lű, Kai; Liu, Guolong; Yan, Lianghong; Chen, Yuyong

doi:10.1016/j.msea.2015.10.065

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…Ti–6Al–4V, which is characterized by formability, biocompatibility, toughness, low density, high strength, anti-corrosion, and excellent high-temperature properties, is the most widely used Ti alloy both commercially and industrially [1]. Due to its abundance and large strength-to-weight ratio, it is extensively applied in medical health, aerospace, national defense, energy, and other fields [2,3]. This alloy in equilibrium consists mainly of a hexagonal close-packed (hcp) α-phase with some body-centered cubic (bcc) β-phase at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Rheological Law and Mechanism for Superplastic Deformation of Ti–6Al–4V

et al. 2019

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The behaviors of and mechanisms acting in Ti–6Al–4V alloy during low-temperature superplastic deformation were systematically studied by using a Gleeble-3800 thermocompression simulation machine. Focusing on the mechanical behaviors and microstructure evolution laws during low-temperature superplastic compression tests, we clarified the changing laws of the strain rate sensitivity index, activation energy of deformation, and grain index at varying strain rates and temperatures. Hot working images based on the dynamic material model and the deformation mechanism maps involving dislocation quantity were plotted on the basis of PRASAD instability criteria. The low-temperature superplastic compression-forming technique zone and the rheological instability zone of Ti–6Al–4V were analyzed by using hot processing theories. The dislocation evolution laws and deformation mechanisms of the grain size with Burgers vector compensation and the rheological stress with modulus compensation during the low-temperature superplastic compression of Ti–6Al–4V were predicted by using deformation mechanism maps.

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Section: Introductionmentioning

confidence: 99%

Rheological Law and Mechanism for Superplastic Deformation of Ti–6Al–4V

et al. 2019

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“…ε)) at elevated temperatures make titanium difficult to deform, compared with other metallic materials. Many studies have investigated the deformation behavior of Ti-based alloys to carry out the processing parameters of hot and superplastic forming [10][11][12][13][14], studying superplastic deformation mechanisms [15,16] and constructing constitutive models of superplastic deformation behavior [17][18][19][20]. ε) and deformation temperature are considered to be the main processing parameters that affect the flow behavior at elevated temperatures, i.e., (T d ).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Temperature and Strain Rate on the Superplastic Deformation Behavior of Ti-Based Alloys in the (α+β) Temperature Field

Mosleh

Mikhaylovskaya

Котов

et al. 2018

Metals

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This paper presents the effect of temperature and strain rate on the superplastic deformation behavior of Ti-3%Mo-1%V-4%Al, Ti-4%V-6%Al, and Ti-1.8%Mn-2.5%Al alloys, which have different initial microstructures. The microstructure, before and after superplastic deformation in the deformation regimes that provided the maximum elongation, was analyzed. The deformation regimes, corresponding to the minimum strain hardening/softening effect, provided a higher elongation to failure due to their low tendency toward dynamic grain growth. As the values of stress became steady (σs), the elongation to failure and strain-hardening coefficient were analyzed under various temperature–strain rate deformation regimes. The analysis of variance of these values was performed to determine the most influential control parameter. The results showed that the strain rate was a more significant parameter than the temperature, with respect to the σs, for the investigated alloys. The most influential parameter, with both the elongation to failure and strain-hardening coefficient, was the temperature of the Ti-3%Mo-1%V-4%Al and Ti-1.8%Mn-2.5%Al alloys and the strain rate of the Ti-4%V-6%Al alloy.

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“…However, the long time high temperature deformation condition usually causes the die to failure, which increases the energy consumption and the processing cost. To improve the superplasticity and study the superplastic deformation behavior of the material at low temperature and high strain rate have attracted much attention recently . Grain boundary sliding (GBS) is often acknowledged as the important surperplastic deformation mechanism, and it is attributed to the diffusional creep and intergranular slip.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Deformation Behavior of Multi‐Pass Warm Rolled Ti–6Al–4V Titanium Alloy at Low Temperature and High Strain Rate

2018

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The superplastic deformation behavior of Ti-6Al-4V alloy is investigated by the tensile tests for multi-pass warm rolled Ti-6Al-4V alloy at temperature of 700-870 C and strain rate of 10 À3 -10 À2 s À1 . A maximum elongation of 1550% is obtained at temperature of 800 C and strain rate of 10 À3 s À1 . Even at the low temperature of 700 C and the high strain rate of 10 À2 s À1 , the elongation is still 356%. The enhanced superplasticity at low temperature and high strain rate is due to the refined microstructure with fragmented and uniformly distributed fine β grains and to the high density dislocation around grain boundaries as well as dynamic recrystallization. The activation energy at temperature of 800 and 870 C is 226.8 and 220.2 kJ mol À1 , but it increases to 377.5 kJ mol À1 at temperature of 700 C. The average activation energy is 274.8 kJ mol À1 suggesting that the predominant deformation mechanism is grain boundary sliding. The coefficient of strain rate sensitivity increases with the temperature.

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Low-temperature superplastic behavior of beta titanium alloy

Cited by 15 publications

References 22 publications

Rheological Law and Mechanism for Superplastic Deformation of Ti–6Al–4V

Rheological Law and Mechanism for Superplastic Deformation of Ti–6Al–4V

Experimental Investigation of the Effect of Temperature and Strain Rate on the Superplastic Deformation Behavior of Ti-Based Alloys in the (α+β) Temperature Field

Superplastic Deformation Behavior of Multi‐Pass Warm Rolled Ti–6Al–4V Titanium Alloy at Low Temperature and High Strain Rate

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