Fatigue behavior of ultrafine-grained Ti–6Al–4V ‘ELI’ alloy for medical applications

Saitova, Lilia R.; Höppel, Heinz Werner; Semenova, Irina P.; Рааб, Г. И.; Valiev, Ruslan Z.

doi:10.1016/j.msea.2008.04.082

Cited by 49 publications

(24 citation statements)

References 7 publications

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“…On the other hand, mechanical strength of b-type alloys is significantly lower than those of CP-Ti and Ti-6Al-4 V. Enhancement in mechanical properties to prolong the lifetime of the implant without alloying is possible by severe plastic deformation (SPD) [4,15,16]. In recent years, a number of SPD techniques have been developed, including equal-channel angular extrusion (ECAP) [17,18], high-pressure torsion (HPT) [10,19], accumulative roll bonding (ARB) [20] and hydrostatic extrusion (HE) [21,22]. They bring about grain refinement down to sub-micron scale [21].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical properties of biocompatible Ti–45Nb alloy by hydrostatic extrusion

et al. 2014

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b-Type titanium alloys are promising materials for orthopaedic implants due to their relatively low Young's modulus and excellent biocompatibility. However, their strength is lower than those of a-or a ? b-type titanium alloys. Grain refinement by severe plastic deformation (SPD) techniques provides a unique opportunity to enhance mechanical properties to prolong the lifetime of orthopaedic implants without changing their chemical composition. In this study, b-type Ti-45Nb (wt%) biomedical alloy in the form of 30 mm rod was subjected to hydrostatic extrusion (HE) to refine the microstructure and improve its mechanical properties. HE processing was carried out at room temperature without intermediate annealing in a multi-step process, up to an accumulative true strain of 3.5. Significant microstructure refinement from a coarse-grained region to an ultrafine-grained one was observed by optical and transmission electron microscopy. Vickers hardness measurements (HV 0.2 ) demonstrated that the strength of the alloy increased from about 150 to 210 HV 0.2 . Nevertheless, the measurements of Young's modulus by nanoindentation showed no significant changes. This finding is substantiated by X-ray diffraction analyses which did not exhibit any phase transformation out of the bcc phase being present still before processing by HE. These results thus indicate that HE is a promising SPD method to obtain significant grain refinement and enhance strength of b-type Ti-45Nb alloy without changing its low Young's modulus, being one prerequisite for biomedical application.

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Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical properties of biocompatible Ti–45Nb alloy by hydrostatic extrusion

et al. 2014

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“…Pure titanium is the material of choice due to it good compatibility with human tissue, although its low mechanical strength, especially under cyclic loads, insufficient hardness and low wear resistance can lead to implant failure 20,21 . The durability of medical implants is an important concern in order to avoid repeated surgical operations to replace implants compromised by fatigue 22 . The excellent corrosion resistance, chemical inertness and biocompatibility of titanium are ascribed to a TiO 2 oxide layer.…”

Section: Characteristics Of Medical Alloysmentioning

confidence: 99%

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

2015

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The use of materials for biomedical applications has become vital to enhance the quality of life and longevity of human beings. Commercially pure titanium (cpTi) and titanium alloys are the most adequate materials for some biomedical applications, but cpTi and the Ti-6Al-4V alloy (Ti G5) have limitations for biomedical application due to low mechanical strength and the possibility of ion release, respectively. In order to address this problem, commercially pure ultrafine grained titanium (UFG Ti) obtained by severe plastic deformation (SPD) has been suggested as a promising alternative for biomedical applications. This thermomechanical process is able to improve the strength of cpTi and titanium alloys while keeping their excellent biocompatibility. The purpose of this review was to compare the mechanical strength of UFG Ti, cpTi and a Ti G5 alloy. In addition, the biological performance of UFG Ti was also evaluated by in vivo testing. Prodigious improvements were seen in surface topography, wettability and in homogeneity of oxide layer. The overall improvements in microstructure provided by ECAP technique coupled with surface etching resulted in a remarkable performance of cpTi alloy for biomedical applications.

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“…Furthermore, the ECAP-processed Ti-6Al-4V alloy followed by applied low-temperature deformation contributed to additional enhancement of strength and keeping sufficient ductility [22]. Saitova et al [23,24] studied fatigue performance and cyclic deformation behavior of the UFG Ti-6Al-4V alloy processed by ECAP. They found that the UFG Ti-6Al-4V alloy exhibited a pronounced improvement in the fatigue life compared to the conventional grain (CG) size counterpart.…”

Section: The Ultrafine-grained Titanium and Biomedical Titanium Alloymentioning

confidence: 99%

The Ultrafine-Grained Titanium and Biomedical Titanium Alloys Processed by Severe Plastic Deformation (SPD)

Lin¹,

Wang²,

Yeung³

et al. 2013

SOJ Mater Sci Eng

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the function of our tissues and organs. Among the biomedical materials, titanium alloys have received attractions for dental and orthopedic implants due to their high strength, great corrosion resistance and biocompatibility, and low density [1,2]. Recently, a series of new β titanium alloys have been developed with low elastic modulus, containing non-toxic alloying elements such as Nb, Ta, Zr and Mo in order to tackle the stress shielding effect caused by stiffness mismatch between implants and bones [3][4][5][6].Several literatures [7][8][9] have reported that compared with traditional titanium alloys, the ultrafine-grained (UFG) biomedical titanium alloys possess higher strength, better corrosion resistance and fatigue performance. Moreover, the ultrafine-grained biomedical titanium alloys, which are usually used for orthopedic and dental implants, can induce in-growth of bone tissues, increase the interfacial strength and accelerate the repair process. An effective technique to introduce the ultrafinegrained structure is called the Severe Plastic Deformation (SPD).The Severe Plastic Deformation (SPD) results in significant grain refinement by imposing high plastic strains on metallic materials. For two decades, several SPD methods, such as equal channel angular pressing (ECAP) [10,11], high pressure torsion (HPT) [12,13], accumulative roll bonding (ARB) [14,15] and friction stir processing (FSP) [16,17], have been developed to produce the ultrafine-grained materials. This paper examines recent developments related to fabricating ultrafine-grained biomedical titanium alloys by SPD methods. More specifically, the mechanical properties and performances of biomedical titanium alloys processed by ECAP, HPT, ARB and FSP have been investigated. Techniques for SPD Methods Equal channel angular pressing (ECAP)The ECAP method is the most developed SPD techniques at IntroductionThe ultrafine-grained titanium and biomedical titanium alloys processed by Severe Plastic Deformation (SPD)It's well known that biomedical metal materials are widely employed in a various kinds of implants, devices and process equipment that contacts biological systems, which improve AbstractThe ultrafine-grained materials processed by severe plastic deformation (SPD) can be tailored to achieve superior properties and performances. Recently, the SPD methods, emerging as an effective way to grain refinement, have become attractive for fabrication of the ultrafine-grained biomedical materials, which can be adjusted to possess both favorable mechanical properties and excellent biocompatibility. Biomedical titanium alloys have become one of the most promising biomedical metallic materials, due to their high strength, low density, good biocompatibility and excellent corrosion resistance. Compared with traditional titanium alloys, the ultrafine-grained biomedical titanium alloys possess higher strength, better corrosion resistance and fatigue performance. Moreover, the ultrafine-grained biomedical titanium alloys, which are usually used for orthopedic...

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Fatigue behavior of ultrafine-grained Ti–6Al–4V ‘ELI’ alloy for medical applications

Cited by 49 publications

References 7 publications

Enhancement of mechanical properties of biocompatible Ti–45Nb alloy by hydrostatic extrusion

Enhancement of mechanical properties of biocompatible Ti–45Nb alloy by hydrostatic extrusion

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

The Ultrafine-Grained Titanium and Biomedical Titanium Alloys Processed by Severe Plastic Deformation (SPD)

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