Effect of low-temperature (77 K) quasihydrostatic extrusion on the properties of high-purity titanium: The role of initial structural state

Tikhonovsky, М.А.; Khaimovich, P. A.; Kutniy, K.V.; Kislyak, I.F.; Okovit, V.S.; Rudycheva, T.Yu.

doi:10.1063/1.4830259

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…This may mean that the grain size is not the only parameter that determines the value of Δ. In [16] it was shown that despite the fact, that the quasihydrostatic extrusion of SPD samples at 300 K (SPD+QHE300) results in some grain refinement (130 nm as compared to 150 nm for the SPD samples), the yield strength σ0.2t decreases. It was suggested that one of the reasons for this anomalous effect could be a change in the stressed state and density of dislocations.…”

Section: Eejp 3 (2019)mentioning

confidence: 99%

“…This strength is conditioned by small grain size, high uniformity of the grain structure and presence of highangle boundaries. In [16] the role of the initial grain size of high-purity titanium samples, obtained by the SPD method and subsequent annealing, was studied in the evolution of their structure and variation of their properties under the impact of CD by the quasi-hydrostatic extrusion (QHE) method at liquid nitrogen temperature. Such a low-temperature deformation resulted in grains refinement in the high-purity sub-microcrystalline titanium up to nanolevel, i.e.…”

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confidence: 99%

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Structural State Effect on Mechanical Properties and Acoustic Emission of High-Purity Titanium at Different Types of Deformation

Kutniy

Kislyak

Kalchenko

et al. 2019

EEJP

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The results on investigations of mechanical properties of high-purity titanium with grains ranging from tens of nanometers up to a few micrometers subjected to uniaxial tension, compression and microindenting are presented. Different structural states in high-purity titanium were formed by severe plastic deformation according to the scheme «upsetting – extrusion – drawing» in combination with annealing at temperatures of 250–550° C and quasi-hydrostatic extrusion at room and liquid nitrogen temperatures. The values of yield strengths and microhardness for samples of high-purity titanium with grains of different sizes are determined. It was shown that the combination of severe plastic deformation with cryogenic quasi-hydrostatic extrusion allowed to create high-purity nanocrystalline titanium with high mechanical properties. The obtained experimental data were analyzed for the implementation of the Hall-Petch relation and discrepancy between the values of yield strengths in tension and compression (strength differential or S-D effect). Satisfactory fulfillment of the Hall-Petch relation for high-purity titanium in the whole range of the studied grain size values was shown and a noticeable difference in the yield values for compression and tension was found. The values of the coefficients in the Hall-Petch equation for deformation by tension, compression and microindenting were determined. These coefficients are noticeably lower than the corresponding values for the industrial grades of titanium, i.e. in high-purity titanium, the grain boundaries are weaker barriers for moving dislocations than in the industrial titanium, whose boundaries are enriched with impurities. The features of the acoustic waves emission during compression of samples in various structural states were studied. It was concluded that the deformation of titanium in all the investigated structural states was carried out by dislocation slip.

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Section: Eejp 3 (2019)mentioning

confidence: 99%

mentioning

confidence: 99%

Structural State Effect on Mechanical Properties and Acoustic Emission of High-Purity Titanium at Different Types of Deformation

Kutniy

Kislyak

Kalchenko

et al. 2019

EEJP

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“…In addition to using separate pressure treatment methods, an effective technique for structure dispersion is the combination of various methods, which are characterized by different stress diagrams. In particular, it was shown in [8] that the combination of severe plastic deformation according to the upsetting-extrusiondrawing scheme with cryogenic quasi-hydroextrusion (QHE) made it possible to create nanocrystalline titanium (grain size 75 nm) of increased purity with high mechanical properties (ultimate strength σ В = 930 MPa, plasticity  ≈ 12%).…”

Section: Introductionmentioning

confidence: 99%

Creation of Various Structures, Including Nanomester Scale, and Investigation of Mechanical and Dissipative Properties of Vt6 Titanium Alloy

Sokolenko¹,

Mats²,

Okovit³

et al. 2022

Problems of Atomic Science and Technology

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With the use of cryogenic deformations by rolling and quasi-hydroextrusion, as well as annealing up to 723 K, various structures, including nanometer ones, were created in ultrafine-grained (UFG) titanium alloy of the VT6 grade, and mechanical and dissipative properties were studied. The deformation regimes for the formation of a nanostructured state with a high level of strength characteristics without loss of plasticity are established. The revealed features of the temperature dependences in the range of 100…600 K of internal friction and shear modulus in the nanostructured state in comparison with the UFG state are analyzed.

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“…Some of these methods (or techniques) were harnessed to produce ultrafine-grained/nanostructured titanium. These techniques of processing titanium can be classified into Basic SPD Processing that includes ECAP [5,8–17,20–32], Accumulative Roll-Bonding [33–37], High Pressure Torsion (HPT) [28,38–58], and Torsion Extrusion [59–61], Conventional Metal Forming-Based Processing including Hydrostatic Extrusion [27,62…”

Section: Introductionmentioning

confidence: 99%

Effects of processing conditions on microstructure and mechanical properties of equal-channel-angular-pressed titanium

Shaat

2018

Materials Science and Technology

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This review presents an investigation on effects of the processing conditions on the microstructural evolution and mechanical properties of commercial pure titanium processed by Equal Channel Angular Pressing (ECAP). An overview of ECAP processing is presented. A discussion on the microstructure evolution of ECAPed titanium emphasising effects of the ECAP-route type, processing temperature, number of ECAP passes, and mechanical/thermal treatments is presented. Moreover, the variations of the mechanical properties (yield strength, tensile strength, and ductility) of titanium as functions of the grain size are reported for the different conditions of ECAP processing. In addition, the best estimates of the Hall–Petch parameters for titanium processed by ECAP, ECAP followed by mechanical and/or thermal annealing are reported.

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Effect of low-temperature (77 K) quasihydrostatic extrusion on the properties of high-purity titanium: The role of initial structural state

Cited by 8 publications

References 12 publications

Structural State Effect on Mechanical Properties and Acoustic Emission of High-Purity Titanium at Different Types of Deformation

Structural State Effect on Mechanical Properties and Acoustic Emission of High-Purity Titanium at Different Types of Deformation

Creation of Various Structures, Including Nanomester Scale, and Investigation of Mechanical and Dissipative Properties of Vt6 Titanium Alloy

Effects of processing conditions on microstructure and mechanical properties of equal-channel-angular-pressed titanium

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