Influence of ECAP routes on the microstructure and properties of pure Ti

Stolyarov, V. V.; Zhu, Yuntian; Alexandrov, Igor; Lowe, Terry C.; Valiev, Ruslan Z.

doi:10.1016/s0921-5093(00)01411-8

Cited by 444 publications

(227 citation statements)

References 23 publications

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“…2 shows that the H-P relation is valid down to 9 nm in commercially pure Ti where the yield stress [YS] is taken as 1/3 rd of the measured microhardness. [76] Based on five investigations, [76][77][78][79][80] the average H-P slope is ~13 MPa mm ½ . A combination of HPT at 5.0 GPa for 10 rotations followed by annealing at 523-273 K (250-300°C) gives more than 1200 MPa in pure Ti with a grain size of 120 nm and this is comparable to the reported strengths of Ti alloys.…”

Section: The Hall-petch Relationship For Ufg Materialsmentioning

confidence: 99%

“…The H-P relationship for Ti; [81] grades 1 to 4 denote increasing orders of impurities for Fe, N and O and using experimental data. [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100] Figure 4. The H-P relationship for coarse-grained and HPT processed Al-5% Mg; [103] with increasing numbers of turns, HAGBs develop and the H-P relationship is followed so that data from coarse grain samples fall on the same line as HPT specimens.…”

Section: Figure Captionsmentioning

confidence: 99%

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The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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Section: The Hall-petch Relationship For Ufg Materialsmentioning

confidence: 99%

Section: Figure Captionsmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…The influence of ECAE routes on the microstructure and mechanical properties of CP Ti was investigated [1]. It was found that processing routes are effective in dictating the resulting grain morphology and structural refinement.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Flow Response Modeling of Ultra-Fine Grained Titanium

Sajadifar

Yapıcı

2015

Metals

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This work presents the mechanical behavior modeling of commercial purity titanium subjected to severe plastic deformation (SPD) during post-SPD compression, at temperatures of 600-900 °C and at strain rates of 0.001-0.1 s −1. The flow response of the ultra-fine grained microstructure is modeled using the modified Johnson-Cook model as a predictive tool, aiding high temperature forming applications. It was seen that the model was satisfactory at all deformation conditions except for the deformation temperature of 600 °C. In order to improve the predictive capability, the model was extended with a corrective term for predictions at temperatures below 700 °C. The accuracy of the model was displayed with reasonable agreement, resulting in error levels of less than 5% at all deformation temperatures.

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“…For the past decade or so, the interest in the application of severe plastic deformation (SPD) techniques to manufacture nanostructured Ti has been motivated by several factors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. First, the reports on the formation of an ultrafine-grained structure from SPD processing and its influence on the mechanical behavior have led to interesting fundamental questions [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Grain refinement in commercially pure Ti by various SPD methods typically leads to ultrafine grain (UFG) structures with an average grain size in the range of 100-600 nm [3][4][5][6][12][13][14][15]. However, it has been reported that the consolidation of the metal powders via SPD methods can be implemented to prepare high-density samples with grain sizes that are smaller than 50 nm [16,17].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

Semenova

Timokhina

Исламгалиев

et al. 2015

Metals

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Abstract:We report on a study of the nanocrystalline structure in Ti, which was produced by cryogenic milling followed by subsequent consolidation via severe plastic deformation using high pressure torsion. The mechanisms that are believed to be responsible for the formation of grains smaller than 40 nm are discussed and the influence of structural characteristics, such as nanometric grains and oxide nanoparticles, on Ti hardening is established.

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Influence of ECAP routes on the microstructure and properties of pure Ti

Cited by 444 publications

References 23 publications

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

High Temperature Flow Response Modeling of Ultra-Fine Grained Titanium

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

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