Service properties of ultrafine-grained Ti–6Al–4V alloy at elevated temperature

Semenova, Irina P.; Рааб, Г. И.; Golubovskiy, E. R.; Valiev, R. Z.

doi:10.1007/s10853-013-7305-x

Cited by 19 publications

(35 citation statements)

References 12 publications

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“…In addition, according to the calculations, all of the Ti-6Al-4V samples at room temperature basically exhibit the same volume fractions of a and b structures (approximately 90 and 10 pct, respectively). This is consistent with the fact that all of the alloys were rolled at the same temperature (873 K (600°C) which is lower than that of a , b transformation (~1248 K (975°C) [5] ).…”

Section: Om and Tem Analysessupporting

confidence: 85%

“…More specifically, according to Eq. [5], the grain boundary strengthening (Dr GB ) can be expressed as:…”

Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 99%

“…Inspection of the published literature shows that despite the fact that various Ti alloys with novel compositions have been designed in recent decades, the Ti-6Al-4V alloy, which is a two-phase (a plus b) alloy combining excellent properties and good producibility, remains as the most widely used Ti alloy [1] and a variety of processing techniques have applied to manufacture high-strength Ti-6Al-4V with improved properties. [2][3][4][5][6][7] One popular processing approach that has been studied in an effort to enhance mechanical properties involves grain refinement of Ti-6Al-4V through severe plastic deformation (SPD) methods, such as high-pressure torsion (HPT) [7] and equal-channel angular pressing (ECAP). [8] For example, it was reported that the ultrafine-grained (UFG; grain size in the range of 100 to 500 nm) Ti-6Al-4V alloy processed by HPT leads to high strain rate superplasticity [7] and that the combination of ECAP and extrusion results in an extremely high ultimate strength (~1510 MPa) in the UFG Ti-6Al-4V.…”

mentioning

confidence: 99%

“…[8] Review of the literature shows that despite impressive results obtained by applying SPD techniques to Ti-6Al-4V, concerns remain as far as the commercial scalability of these approaches. Accordingly, recent efforts [4][5][6][7][8] aimed at refining the microstructure of Ti-6Al-4V alloy have emphasized more conventional thermomechanical processing routes, such as hot isostatic pressing, [6] multiaxial forging, [4] isothermal compression. [2,9] For instance, a recent study shows that ultrafine equiaxed grains with a size of 150 to 800 nm can be obtained through isothermal hot compression of Ti-6Al-4V alloy with a lamellar a + b starting microstructure.…”

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confidence: 99%

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Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Sun

Lavernia

et al. 2015

Metall Mater Trans A

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To provide insight into the mechanical behavior and microstructural evolution of bulk ultrafinegrained (UFG) Ti-6Al-4V alloys, we produced Ti-6Al-4V alloy sheets with grain size smaller than 300 nm through severe warm rolling of three different starting microstructures (i.e., lamellar, equiaxed, and hybrid, that is half equiaxed plus half lamellar microstructures) with various reduction ratios (i.e., 60, 70, 80, and 90 pct) at 873 K (600°C). Accordingly, the tensile behavior, microhardness, grain size, and dislocation density of the UFG Ti-6Al-4V alloys with different starting microstructures and reduction ratios were comparatively analyzed. Our results show that, following the continuous enhancement of tensile strength and hardness as the rolling reduction ratio increased from 0 to 70 pct, there was a saturation state in which the values of strength and hardness remained constant as the reduction ratio further increased from 70 to 90 pct for all the alloy samples with different starting microstructures. In terms of microstructural evolution, although grain size decreased and dislocation density increased continuously as the rolling reduction ratio increased from 0 to 70 pct, grain size and dislocation density did not change significantly when the reduction ratio further increased from 70 to 90 pct. Our results suggest that, whereas the starting microstructure influences the early stages of grain refinement and mechanical performance, this influence diminishes as the rolling reduction ratio is increased beyond a critical value. This behavior was rationalized on the basis of the limits of grain boundary and dislocation strengthening during severe warm rolling.

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Section: Om and Tem Analysessupporting

confidence: 85%

“…More specifically, according to Eq. [5], the grain boundary strengthening (Dr GB ) can be expressed as:…”

Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Sun

Lavernia

et al. 2015

Metall Mater Trans A

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“…[11,12] Thus, there have been no earlier studies on the creep behavior at relatively low temperatures close to the operating temperatures for this alloy in the range from 473 to 673 K. [13] It was previously shown that the Ti-6Al-4V alloy in the UFG state demonstrates the thermal stability of the structure and creep resistance at temperatures up to 573 K; however, at higher test temperatures, the alloy softens due to the development of grain recovery and enlargement processes. [11,14] This means that studies of the creep resistance of Ti alloys remain an important task for use of these alloys in aerospace applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Creep Resistance of an Ultrafine‐Grained Ti–6Al–4V Alloy with Modified Surface by Ion Implantation and (Ti + V)N Coating

et al. 2020

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This research examines the creep behavior of an ultrafine‐grained (UFG) Ti−6Al−4V alloy processed by equal‐channel angular pressing followed by extrusion. It is shown that modifying the surface of the UFG alloy with nitrogen ions and then applying of a coating of (Ti + V)N inhibits the softening of the UFG alloy at temperatures up to 700 K due to a barrier effect in which the coating hinders the release of dislocations onto the surface. The differences in the mechanisms of crack initiation and failure of UFG samples are also examined both with and without a coating. The prospects of the proposed approach to the improving of titanium alloys are discussed, including the formation of an UFG structure in the bulk of the material and subsequent modification by ion‐plasma methods for the manufacture of highly loaded parts operating at elevated operating temperatures.

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Ultrafine‐Grained Titanium‐Based Alloys: Structure and Service Properties for Engineering Applications

et al. 2019

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Herein, an overview of the recent research on the relationship between the ultrafine‐grained (UFG) structure of titanium and its alloys and the physical and mechanical properties of the materials, as well as the formation of advanced functional and service properties, including fatigue strength, creep behavior, and impact and fracture toughness is presented. It is shown that due to the record properties achieved in UFG titanium and its alloys, these materials have an innovative potential for successful application in medicine and engineering industries. Some of these works are carried out in cooperation with the team of Prof. Terence G. Langdon. Professor Langdon made a significant contribution to the development of modern materials science in the field of nanostructured metallic materials.

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Service properties of ultrafine-grained Ti–6Al–4V alloy at elevated temperature

Cited by 19 publications

References 12 publications

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Enhanced Creep Resistance of an Ultrafine‐Grained Ti–6Al–4V Alloy with Modified Surface by Ion Implantation and (Ti + V)N Coating

Ultrafine‐Grained Titanium‐Based Alloys: Structure and Service Properties for Engineering Applications

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