Effect of the simultaneous enhancement in strength and corrosion resistance of microcrystalline titanium alloys

Чувильдеев, В. Н.; Копылов, В. И.; Bakhmet’ev, A. M.; Sandler, N. G.; Нохрин, А. В.; Tryaev, P. V.; Lopatin, Yu. G.; Kozlova, N. A.; Пискунов, А. В.; Мелехин, Н. В.

doi:10.1134/s1028335812010119

Cited by 16 publications

(5 citation statements)

References 3 publications

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“…The proportion of high-angle grain boundaries increased with the increasing number of passes, which caused the uniformity of the microstructure to increase. 23 Further, restoration, primarily recovery and recrystallization, was proved to significantly impact grain refining at temperatures of 200°C-450°C. 24,25 ImageJ software was used to determine the average grain size of samples as an image analysis software.…”

Section: Human Osteoblast Cell Line Culturementioning

confidence: 99%

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Hashemi

Borhani

Nourbakhsh

2022

Journal of Applied Biomaterials & Functional Materials

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When it comes to using bio-metals, the chemical and biocompatibility properties of titanium led to its widespread use in biomedical implants. However, pure titanium possesses lower mechanical properties than Ti alloys containing cytotoxic elements. Severe plastic deformation (SPD) techniques were able to cause a significant strength increase, corrosion behavior improvement, and the release of the alloying elements. In this study, the ECAP process was performed on commercially pure titanium with a square cross-section at two and four passes, which resulted in a finer grain size and a more uniform microstructure. In order to improve cell behaviors, etch treatment was performed to produce nano-rough and nano-texture surfaces for all Ti samples. The effect of surface etching on corrosion, surface roughness, and cell behaviors on ECAP and untreated samples was also investigated. Optical/Field Emission Scanning Electron Microscopy, Atomic Force Microscopy, and X-Ray Diffraction were used to study the microstructural characterizations of samples. In addition, the impact of grain structure on the contact angle, electrochemical corrosion behavior, osteoblast response, and cell viability was investigated. The titanium that was ECAPed four times provided finer grains (200 nm) than the unprocessed sample (25 µm). The potentiodynamic polarization test revealed that corrosion resistance of ECAPed samples was enhanced, which was associated with grain refinement, affecting the passive film formation. Corrosion resistance and wettability experienced an apparent increase after each ECAP pass. In conclusion, improvement of grain size and surface roughness was due to the simultaneous effect of ECAP and etching treatment that led to the osteoblast response and cellular activity of samples.

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Section: Human Osteoblast Cell Line Culturementioning

confidence: 99%

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Hashemi

Borhani

Nourbakhsh

2022

Journal of Applied Biomaterials & Functional Materials

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“…Increasing the number of ECAP passes to four would lead to a simultaneous increase of strength and ductility which stems from an increased fraction of high angle grain boundaries and the improved homogeneity of the microstructures. 27 It is worth mentioning that the density of dislocations in the subgrain boundaries is relatively high and the newly developed grains have high angle grain boundaries. Previous investigations have shown that the main mechanisms of grain refinement at temperatures 200-450 C would be restoration, predominantly recovery and partial recrystallization.…”

Section: Investigation Of Biocompatibility In Vitromentioning

confidence: 99%

Surface characterization of nanostructured commercially pure titanium modified by sandblasting and acid-etching for implant applications

Reshadi

Khorasani

Faraji

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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This study investigated the surface characteristics of ultrafine-grain commercially pure titanium (UFG CP-Ti) substrates produced by equal channel angular pressing (ECAP), compared with those of coarse-grain commercially pure titanium (CG CP-Ti) and Ti–6Al–4V (Ti-64) substrates. All Ti surfaces were sandblasted and acid-etched (SLA-treated) to produce micro-rough surfaces. Tensile and microhardness tests were carried out to measure the mechanical properties of fabricated samples. Then the surface characteristics of samples including contact angle measurements, surface morphology and in vitro cell response were evaluated after polishing, sandblasting and acid etching procedures. The results showed that after applying four passes of ECAP, the average grain size of microstructure decreased from 25 µm to 170 nm, while the ultimate tensile strength increased from 545 ± 24 MPa to 971 ± 38 MPa. Investigation of surface morphologies carried out by scanning electron microscopy indicated that ECAP-processed substrate exhibits nano-topography compared with CG CP-Ti and Ti-64 substrates after applying SLA process. In addition, the contact angle of SLA-treated CG CP-Ti and UFG CP-Ti substrates decreased from 68.3° to 9.5° and 51.9° to 7.4°, respectively, indicating a significant improvement of surface wettability. The morphologies of MG63 cells cultured on the developed surfaces proved the potential superior osteoblast cell compatibility of the micro-roughened surface made of UFG CP-Ti substrates over CG CP-Ti and Ti-64 substrates.

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“…We should note that it is possible to increase the hotsalt corrosion resistance of titanium alloys by decreasing the impurity concentration at grain boundary. Thus, the hot-salt corrosion resistance increase was observed in submicrocrystalline modifications of titanium alloys with grain sizes ranging from 0.2 µm to 1 µm obtained by equal channel angular extrusion [5,6].…”

Section: Materials and Procedures Of The Studiesmentioning

confidence: 99%

Hot-salt corrosion of alloys PT-7M, 42ХНМ, Inconel 690, Incoloy 800

et al. 2019

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The Article contains the results of the study performed for the samples made from alloys PT-7М, 42ХНМ, Inconel 690, Incoloy 800 for resistance against hot salt corrosion in the mixture of crystallized NaCl and KBr salts, in ratio 300:1 by weight, and in the temperature range from 150 °С to 300 °С, both in contact with the air and in a leak-tight autoclave in the atmosphere of saturated water steam. Regularities of hot salt corrosion behavior in the alloys under the study were detected under testing conditions. The atmosphere of saturated water steam inhibits development of halt salt corrosion of alloy ПТ-7М in the entire temperature range of the testing.

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Effect of the simultaneous enhancement in strength and corrosion resistance of microcrystalline titanium alloys

Cited by 16 publications

References 3 publications

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Surface characterization of nanostructured commercially pure titanium modified by sandblasting and acid-etching for implant applications

Hot-salt corrosion of alloys PT-7M, 42ХНМ, Inconel 690, Incoloy 800

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