Influence of temperature and hydrostatic pressure during equal-channel angular pressing on the microstructure of commercial-purity Ti

Рааб, Г. И.; Soshnikova, E.P.; Valiev, Ruslan Z.

doi:10.1016/j.msea.2004.01.137

Cited by 59 publications

(34 citation statements)

References 2 publications

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“…This maximum Hv value (3.8 GPa) after 2sHPT process is much higher than those measured for other processes with different strain paths, e.g. ECAP with route B A or B C , 7,8,[28][29][30][31][32] and ECAP + other deformation process (rolling, extrusion or HPT). 29,30,32) However, as shown in Fig.…”

Section: Two-steps Hpt (2shpt) Experimentsmentioning

confidence: 57%

“…Finally, the Hv in the whole disk (r > 0:5 mm) showed the approximate value of 3.5 GPa, and the Hv hardly increased with further HPT turns (N > 10). This obtained Hv value (3.5 GPa) is much higher than those by ECAP 7,8,[28][29][30][31][32] and ARB 35) processes. This seems to be because HPT-straining can deform titanium at low temperature with large amount of strain and strain gradient.…”

Section: Monotonic Hpt (Mhpt) Experimentsmentioning

confidence: 64%

“…In the previous ECAP experiments, 1,2,[22][23][24][25][26][27][28][29][30][31][32] the influences of strain path on grain refinement and on mechanical properties were investigated in various materials. The monotonic and cyclic deformations in HPT process correspond to routes A and C in ECAP process, 23) and also ECAP routes to deform with different strain path, like 2sHPT process, are routes B A , B C , etc.…”

Section: Discussionmentioning

confidence: 99%

“…From comparison of the deformation conditions in HPT, BM and SP, multi-directional deformation (repetitive deformation with different strain paths) is suggested as the other factor to facilitate grain refinement. 20,21) In fact, it is well-known that the strain paths in ECAP process significantly affect grain refinement and mechanical properties, 1,2,[22][23][24][25][26][27][28][29][30][31][32] but there are few reports of such investigation in HPT process. 33) The present study aims to investigate the effect of strain path in HPT process on hardening in commercial purity titanium (CP-Ti).…”

Section: )mentioning

confidence: 99%

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Effect of Strain Path in High-Pressure Torsion Process on Hardening in Commercial Purity Titanium

et al. 2008

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The effect of strain path in high-pressure torsion (HPT) process on hardening was investigated in commercial purity titanium (Ti-0.03Fe-0.03O, mass%). After monotonic HPT (mHPT) straining up to N ¼ 10 turns at a rotation speed of 0.2 rpm under a pressure of P ¼ 5 GPa, the obtained Vickers microhardness, Hv, was around 3.5 GPa and the microstructure consisted of equiaxed grains of 100 $ 200 nm with high dislocation density. This Hv value was hardly increased even with further strain and strain gradient (further rotation). To investigate the effect of strain path, cyclic (cHPT) and two-steps HPT (2sHPT) processes were carried out. The cHPT-straining performed by repetitive deformation of N ¼ 1=2. In comparison with the mHPT process, the Hv was attained rapidly to the saturated value (Hv 3.5 GPa). However, the maximum Hv value was similar to that obtained by mHPT-straining. In the 2sHPT process, first the disk of 20 mm in diameter was deformed by HPTstraining. Secondly, the disk of 10 mm was cut to contact with the circumference of the deformed disk, and then it was deformed. A higher hardness (Hv 3.8 GPa) was obtained than that by monotonic or cyclic HPT-straining. These results indicate that multi-directional deformations (deformations with different strain paths) contribute to the hardening improvement.

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Section: Two-steps Hpt (2shpt) Experimentsmentioning

confidence: 57%

Section: Monotonic Hpt (Mhpt) Experimentsmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Effect of Strain Path in High-Pressure Torsion Process on Hardening in Commercial Purity Titanium

et al. 2008

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“…Free from these disadvantages is the technique of equal-channel angular pressing combined with Conform (ECAP-C) [13][14][15][16]. ECAP-C solves the above-mentioned problems, typical of conventional ECAP: it enables producing by deformation immediately a long-length rod (semiproduct); this technique has a high metal utilization factor and a high productivity [16].…”

Section: Introductionmentioning

confidence: 99%

Transformation of the microstructure and properties of ultrafine-grained TiNi alloys during the processing by ECAP-conform via the isothermal regime

2017

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Abstract. This paper examines a technique for producing a TiNi alloy with an ultrafine-grained structure and enhanced mechanical characteristics. It is demonstrated that the use of the ECAP-Conform technique enables producing TiNi alloy samples with an ultimate tensile strength of up to 1300 MPa and a rather high level of ductility. Studies show that in this alloy, there forms a banded deformation microstructure with a structural element size of up to 300 nm, and during subsequent annealings there forms a grain structure with a grain size of about 200 nm.

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Development of Processing Using Equal‐Channel Angular Pressing

Valiev¹,

Zhilyaev²,

Langdon³

2013

Bulk Nanostructured Materials

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Influence of temperature and hydrostatic pressure during equal-channel angular pressing on the microstructure of commercial-purity Ti

Cited by 59 publications

References 2 publications

Effect of Strain Path in High-Pressure Torsion Process on Hardening in Commercial Purity Titanium

Effect of Strain Path in High-Pressure Torsion Process on Hardening in Commercial Purity Titanium

Transformation of the microstructure and properties of ultrafine-grained TiNi alloys during the processing by ECAP-conform via the isothermal regime

Development of Processing Using Equal‐Channel Angular Pressing

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