Increasing strength of a biomedical Ti-Nb-Ta-Zr alloy by alloying with Fe, Si and O

Stráský, Josef; Harcuba, Petr; Václavová, Kristína; Horváth, Klaudia; Landa, Michal; Srba, Ondřej; Janeček, Miloš

doi:10.1016/j.jmbbm.2017.03.026

Cited by 79 publications

(57 citation statements)

References 59 publications

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“…As expected, lower temperatures and higher strain rates lead to higher compressive strength. The sample deformed at T = 800 • C withε = 0.01 s −1 exhibits the sharp yield point similarly to the tensile flow curves performed at room temperature [13]. On the other hand, flow curves measured at higher temperatures did not exhibit the sharp yield point because the temperature is sufficiently high to activate diffusion of oxygen in matrix and prevent pinning dislocations by interstitial oxygen atoms.…”

Section: Resultssupporting

confidence: 59%

“…However, their strength is approximately only one half of that of Ti64. Small amount of oxygen addition, typically 0.3%-0.5%, has a great strengthening effect on this type of β-Ti alloys [8][9][10][11] and adding more than 0.5% of oxygen, as in Ti-35.3Nb-7.3Zr-5.7Ta-0.7O, yields even higher strength, sharp yield point and deformation strengthening [12,13]. The addition of 0.7% of oxygen raises Young's modulus to the value of 80 GPa that is still significant improvement to 110 GPa of Ti64.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

et al. 2018

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Sufficient biocompatibility and high strength are fundamental properties required for total joint endoprostheses material. Recently developed Ti-based alloy Ti-35.3Nb-7.3Zr-5.7Ta-0.7O (wt%) exhibits these properties. However, the as-cast material does not meet requirements for fatigue resistance due to pores and very coarse grain structure and therefore a feasible forming procedure must be established. Gleeble apparatus was used to deform the studied alloy at high temperatures (from 800 • C to 1400 • C) and high strain rates (up to 1 s −1) to the total strain of 0.5. Mechanical properties at elevated temperatures were evaluated. The resulting microstructure was investigated by scanning electron microscopy and electron backscatter diffraction (EBSD). It was found that forming procedure should be performed at temperatures higher than 1400 • C to reach conditions similar to forming of Ti-6Al-4V. Calculation of kernel average misorientation from EBSD data showed that most deformation is stored in the material in the vicinity of grain boundaries without any apparent recrystallization.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

et al. 2018

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“…In the rolled conditions, the yield points are significantly "sharper" compared to forged conditions. The reason for the occurrence of a sharp yield point was the interaction of dislocations with interstitial oxygen atoms [21,38]. Table 5.…”

Section: Tensile Testingmentioning

confidence: 99%

“…In contrast, in alloys containing α phase (either α + β alloys or metastable β alloys aged to α + β condition), the maximum allowed oxygen content is limited typically to 0.2 wt% to avoid embrittlement [20]. Interstitial strengthening by oxygen has been thoroughly studied in our previous work on as-cast Ti-35Nb-7Zr-6Ta based alloys with various oxygen contents [21].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

et al. 2019

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Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction.

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“…Thus, many strengthening strategies involving diverse thermomechanical treatment strategies to positively influence the fatigue strength were in focus of research. Whereas work hardening for instance increases the static strength, fatigue strength remains mostly unaltered [15][16][17][18][19][20][21][22][23][24]. The most significant effect in case of TiNb-based alloys seems to be possible due to precipitation and grain boundary hardening in order to effectively hinder dislocations to move through the material and thus, positively influence the fatigue limit [16,18].…”

Section: Introductionmentioning

confidence: 99%

Effects of thermomechanical history and environment on the fatigue behavior of (β)-Ti-Nb implant alloys

et al. 2018

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Abstract. This study examined the fatigue properties of a newly developed cast and thermomechanical processed (β)-Ti-40Nb alloy for a possible application as biomedical alloy due to exceptional low Young's modulus (64-73 GPa), high corrosion resistance and ductility (20-26%). Focusing on the influence of two microstructural states with fully recrystallized β-grain structure as well as an aged condition with nanometer-sized ω-precipitates, tension-compression fatigue tests (R=-1) were carried out under lab-air and showed significant differences depending on the β-phase stability under cyclic loading. Present ω-precipitates stabilized the β-phase against martensitic α'' phase transformations leading to an increased fatigue limit of 288 MPa compared to the recrystallized state (225 MPa), where mechanical polishing and subsequent cyclic loading led to formation of α''-phase due to the metastability of the β-phase. Additional studied commercially available (β)-Ti-45Nb alloy revealed slightly higher fatigue strength (300 MPa) and suggest a change in the dominating cyclic deformation mechanisms according to the sensitive dependence on the Nb-content. Further tests in simulated body fluid (SBF) at 37°C showed no decrease in fatigue strength due to the effect of corrosion and prove the excellent corrosion fatigue resistance of this alloy type under given test conditions.

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Increasing strength of a biomedical Ti-Nb-Ta-Zr alloy by alloying with Fe, Si and O

Cited by 79 publications

References 59 publications

High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

Effects of thermomechanical history and environment on the fatigue behavior of (β)-Ti-Nb implant alloys

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