Hot deformation and microstructural damage mechanisms in extra-low interstitial (ELI) grade Ti–6Al–4V

Seshacharyulu, T.; Medeiros, S.C.; Morgan, James T.; Malas, James C.; Frazier, William G.; Prasad, Y. V. R. K.

doi:10.1016/s0921-5093(99)00173-2

Cited by 208 publications

(70 citation statements)

References 13 publications

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“…Lamellae globularization is widely observed in hot deformation processes of titanium alloys and investigated by many researchers [17,25,26,34]. One widely accepted globularization mechanism considers that the globularization consists of two events: shearing of laths and formation of globules [17,25].…”

Section: Lamellae Globularizationmentioning

confidence: 99%

“…One widely accepted globularization mechanism considers that the globularization consists of two events: shearing of laths and formation of globules [17,25]. The detailed process was described by Seshacharyulu et al [17] and the schematic illustration was presented in Fig. 14. Here, a brief description is as follows.…”

Section: Lamellae Globularizationmentioning

confidence: 99%

“…Taking the appearance of equiaxed a grains for example, many hypotheses could account for it, e.g. laths shearing and interfaces migration by diffusion [17], DDRX [18], CDRX [19], rotational dynamic recrystallization (RDRX) [20] and geometric dynamic recrystallization (GDRX) [21,22].…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Zhu

Lai

et al. 2013

Materials & Design (1980-2015)

102

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a b s t r a c tIsothermal tensile tests have been performed to study the deformation mechanisms and microstructure evolution of Ti-6Al-2Zr-1Mo-1V titanium alloy in the temperature range 750-850°C and strain rate range 0.001-0.1 s À1. The deformation activations have been calculated based on kinetics rate equation to investigate the hot deformation mechanism. Microstructures of deformed samples have been analyzed by electron backscatter diffraction (EBSD) to evaluate the influences of hot deformation parameters on the microstructure evolution and recrystallization mechanism. The results indicate that deformation mechanisms vary with deformation conditions: at medium (800°C) and high (850°C) temperature, the deformation is mainly controlled by the mechanisms of dislocation creep and self-diffusion, respectively. The microstructure globularization mechanisms also depend on deformation temperature: in the temperature range from 750 to 800°C, the high angle grain boundaries are mainly formed via dislocation accumulation or subgrain boundaries sliding and subgrains rotation; while at high temperature of 850°C, recrystallization is the dominant mechanism. Especially, the evolution of the recrystallization mechanism with the deformation temperature is first observed and investigated in TA15 titanium alloy.

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Section: Lamellae Globularizationmentioning

confidence: 99%

Section: Lamellae Globularizationmentioning

confidence: 99%

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An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Zhu

Lai

et al. 2013

Materials & Design (1980-2015)

102

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“…For thermal cycles through the ␣ + ␤ range of Ti-6Al-4V, the instantaneous creep rate is related to temperature through the relative volume fractions of the two phases, as well as the creep laws of those phases and the micromechanisms of their compatible deformation. 30,32 Rather than model this complex …”

Section: Appendixmentioning

confidence: 99%

Tensile fracture during transformation superplasticity of Ti–6Al–4V

Schuh¹,

Dunand

2001

J. Mater. Res.

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During thermal cycling through the ␣-␤ phase transformation under the action of a small external biasing stress, Ti alloys exhibit an average deformation stress exponent of unity and achieve superplastic strains. We report tensile experiments on Ti-6Al-4V with an applied stress of 4.5 MPa, aimed at understanding the failure processes during transformation superplasticity. The development of cavities was assessed as a function of superplastic elongation, and macroscopic neck formation was quantified at several levels of elongation by digital imaging techniques. The effects of thermal inhomogeneity on neck initiation and propagation were also elucidated experimentally. Tensile ductility during transformation superplasticity is compared with that during isothermal creep at the average, effective cycling temperature, and a numerical model is used to show the effect of thermal gradients in limiting superplastic elongation.

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“…Such a microstructural evolution can be understood in terms of the dynamic globularization [33][34][35][36]. A groove formed at the phase/grain boundaries splits a platelet into several pieces by deepening along the boundary in the platelet.…”

Section: Discussionmentioning

confidence: 99%

Manufacturing Ultrafine-Grained Ti-6Al-4V Bulk Rod Using Multi-Pass Caliber-Rolling

Lee

Shih

Lee

et al. 2015

Metals

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Ultrafine-grained (UFG) Ti-6Al-4V alloy has attracted attention from the various industries due to its good mechanical properties. Although severe plastic deformation (SPD) processes can produce such a material, its dimension is generally limited to laboratory scale. The present work utilized the multi-pass caliber-rolling process to fabricate Ti-6Al-4V bulk rod with the equiaxed UFG microstructure. The manufactured alloy mainly consisted of alpha phase and showed the fiber texture with the basal planes parallel to the rolling direction. This rod was large enough to be used in the industry and exhibited comparable tensile properties at room temperature in comparison to SPD-processed Ti-6Al-4V alloys. The material also showed good formability at elevated temperature due to the occurrence of superplasticity. Internal-variable analysis was carried out to measure the contribution of deformation mechanisms at elevated temperatures in the manufactured alloy. This revealed the increasing contribution of phase/grain-boundary sliding at 1073 K, which explained the observed superplasticity.

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Hot deformation and microstructural damage mechanisms in extra-low interstitial (ELI) grade Ti–6Al–4V

Cited by 208 publications

References 13 publications

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Tensile fracture during transformation superplasticity of Ti–6Al–4V

Manufacturing Ultrafine-Grained Ti-6Al-4V Bulk Rod Using Multi-Pass Caliber-Rolling

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