Fatigue resistance of titanium with ultrafine-grained structure

Semenova, Irina P.; Salimgareeva, Gulnaz; Латыш, В. В.; Кунавин, С. А.; Valiev, R. Z.

doi:10.1007/s11041-009-9123-y

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…Regarding titanium and titanium alloys, static and dynamic mechanical behavior can be modified by enhancing the bulk nanostructure of metallic materials. 1,2 Mechanical stability is imperative to produce reliable medical implants, decreasing the incidence of failures and consequently, revision surgeries for these implants; moreover, smaller-sized implants can be produced to supply the same functionality with less invasive surgeries necessary to perform the implantation. 3 The outer surface region that is in contact with biofluid, ions, molecules, macromolecules, and cells plays a vital role in the biological stability of implantable biomaterials, which is equally important as the mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>

Oliveira

Toniato

Ricci

et al. 2019

IJN

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Background: Nanophase surface properties of titanium alloys must be obtained for a suitable biological performance, particularly to facilitate cell adhesion and bone tissue formation. Obtaining a bulk nanostructured material using severe plastic deformation is an ideal processing route to improve the mechanical performance of titanium alloys. By decreasing the grain size of a metallic material, a superior strength improvement can be obtained, while surface modification of a nanostructured surface can produce an attractive topography able to induce biological responses in osteoblastic cells. Methods: Aiming to achieve such an excellent synergetic performance, a processing route, which included equal channel angular pressing (ECAP), hot and cold extrusion, and heat treatments, was used to produce a nanometric and ultrafine-grained (UFG) microstructure in the Ti-6Al-7Nb alloy (around of 200 nm). Additionally, UFG samples were surface-modified with acid etching (UFG-A) to produce a uniform micron and submicron porosity on the surface. Subsequently, alkaline treatment (UFG-AA) produced a sponge-like nanotopographic substrate able to modulate cellular interactions. Results: After several kinds of biological tests for both treatment conditions (UFG-A and UFG-AA), the main results have shown that there was no cytotoxicity, expressed alkaline phosphatase activity and total protein amounts without statistical differences compared to control. However, the UFG-AA samples presented an attractive effect on the cell membranes, and cell adhesions were preferentially induced as compared with UFG-A. Both conditions demonstrated cell projections, but for UFG-AA, cells were more widely dispersed, and more quantities of filopodia formation could be observed. Conclusion: Herein, the reasons for such behaviors are discussed, and further results are presented in addition to those mentioned above.

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Section: Introductionmentioning

confidence: 99%

<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>

Oliveira

Toniato

Ricci

et al. 2019

IJN

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“…An increase in ductility without a considerable decline in strength was achieved due to the optimization of the regimes of a combined deformation treatment. In [36], the process of producing UFG Grade 4 Ti rods included a combination of ECAP and subsequent drawing with intermediate annealing. The mechanical properties reached very high values, with the preservation of a satisfactory ductility: UTS 1235 MPa and elongation 11%.…”

Section: Fatigue Behavior Of Cp Ti Produced By Severe Plastic Deforma...mentioning

confidence: 99%

“…In [39], for Grade 4 Ti rods produced by ECAP in combination with drawing and annealing at 350 • C for 6 h, the endurance limit of the specimens grew from 590 to 610 MPa, as a result of an increase in strength to 1250 MPa and ductility from 11 to 13%. Here, the tests were performed on the basis of 10 7 cycles in a more rigid symmetrical cycle R = −1, unlike in [36]. According to the authors, the extraordinary simultaneous increase in strength and ductility after 6 h of annealing may have been associated with recovery processes of non-equilibrium boundaries, which were accompanied with ordering of their structure and a decrease in the dislocation density, and with impurity segregation formation in the boundaries and near-boundary areas.…”

Section: Fatigue Behavior Of Cp Ti Produced By Severe Plastic Deforma...mentioning

confidence: 99%

Fatigue Properties of Ti Alloys with an Ultrafine Grained Structure: Challenges and Achievements

Semenova

Modina

Stotskiy

et al. 2022

Metals

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Ultrafine-grained (UFG) structure formation in Ti alloys, by severe plastic deformation (SPD) processing and enhancement of their mechanical properties, including fatigue properties, has been demonstrated in numerous studies in the past 20 years. The present overview analyzes the fatigue properties achieved to date in Ti alloys subjected to SPD. Such aspects are examined as the effect of a UFG structure on the fatigue behavior of commercially pure (CP) Ti, two-phase Ti alloys, using the popular Ti-6Al-4V alloy as an example, as well as on the kinetics and mechanisms of fatigue failure. The prospects and problems of the practical application of UFG Ti materials in medicine and aircraft engine construction are discussed.

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“…Annealing after ECAP, on the other hand, does not involve significant changes in the grain size although a small increase in the grain size might be observed (see Table 3). For example, the grain size was increased from 120 to 150 nm after annealing at for 1.5 h [154].…”

Section: Microstructure Of Titanium Processed By Ecapmentioning

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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Fatigue resistance of titanium with ultrafine-grained structure

Cited by 15 publications

References 6 publications

<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>

<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>

Fatigue Properties of Ti Alloys with an Ultrafine Grained Structure: Challenges and Achievements

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

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Fatigue resistance of titanium with ultrafine-grained structure

Cited by 15 publications

References 6 publications

<p>Biological response of chemically treated surface of the ultrafine-grained Ti&ndash;6Al&ndash;7Nb alloy for biomedical applications</p>

<p>Biological response of chemically treated surface of the ultrafine-grained Ti&ndash;6Al&ndash;7Nb alloy for biomedical applications</p>

Fatigue Properties of Ti Alloys with an Ultrafine Grained Structure: Challenges and Achievements

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

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Product

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<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>

<p>Biological response of chemically treated surface of the ultrafine-grained Ti–6Al–7Nb alloy for biomedical applications</p>