Elastic modulus of biomedical titanium alloys by nano-indentation and ultrasonic techniques—A comparative study

Majumdar, P.; Singh, Shiv Brat; Chakraborty, M.

doi:10.1016/j.msea.2007.12.029

Cited by 149 publications

(81 citation statements)

References 37 publications

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“…The consequence is the stabilization of β phase, and the decrease of the critical cooling rates by which the transformations β→α and β→ω were completely suppressed for all cooling conditions. Many other authors agree that the higher the Ta content is, the lower will be the M s temperature [3,5,[18][19][20]. In the case of the sample 2 (after homogenization treatment) the martensitic transformation β→α was suppressed and the resulted structure was formed only by β phase, attested by XRD patterns in Fig.…”

Section: Results and Discussion For Xrd Measurementsmentioning

confidence: 83%

“…The ability of these metastable β-Ti alloys to undergo a deformation-induced martensitic transformation during cold-rolling has already been demonstrated [3,5]. The advantage of this phenomenon appearing, from biomedical point of view, is an additional decrease of the elastic modulus [5], besides the diminution determined by an increase of the Ta content [3,5,[21][22][23]. This aspect will be discussed below with nanoindentation measurement results.…”

Section: Results and Discussion For Xrd Measurementsmentioning

confidence: 90%

“…Even if the elastic modulus of commonly used biocompatible (α + β)-Ti alloys (100-110 GPa) is much smaller than that of the stainless steel (210 GPa), it remains significantly higher than that of bone tissue with an elastic modulus in the range of 10-40 GPa [3]. This gives rise to the so-called "stress shielding" effect that can cause bone resorption and loosening of implants [4].…”

Section: Introductionmentioning

confidence: 99%

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XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

Cincă¹,

Nocivin²,

Răducanu³

et al. 2021

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Ti-Nb-Ta-Zr alloys (TNTZ) represent a new class of biomaterials, due to nontoxic chemical elements and promising combination of high mechanical resistance with low elastic modulus close to the bone elasticity (E = 20-40 GPa). The present paper proposes a particular chemical composition of this β type Ti alloy -Ti-29Nb-9Ta-10Zr (wt.%) with a particular material structure. Structural and mechanical characterization of four distinct alloy conditions corresponding to each TM stage was performed using XRD measurements and also nanoindentation measurements. The obtained results represent a solid base for complex optimization of the alloy's structural characteristics.K e y w o r d s : beta titanium alloy, thermo-mechanical processing, XRD spectra, nanoindentation

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Section: Results and Discussion For Xrd Measurementsmentioning

confidence: 83%

Section: Results and Discussion For Xrd Measurementsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

Cincă¹,

Nocivin²,

Răducanu³

et al. 2021

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“…In all cases a decrease in the bending strength is observed with increasing of [Mo]eq (Fig 3) where a larger amount of beta phase is observable. Usually the elastic modulus of CP-Ti is around 120 GPa [17]. The appearance of beta phase cause a decrease in elastic modulus, obtaining values between 75-83 GPa for EB and 50-59 GPa for MA, if measured by ultrasonic methods.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructural characterisation of Ti–Nb–(Fe–Cr) alloys obtained by powder metallurgy

et al. 2014

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Abstract:Ti β-alloys based on the Ti-Nb alloy system exhibit growing interest in the biomaterial community. The addition of small amounts of Fe and Cr further increases β-phase stability, improving the properties of Ti-Nb alloy. Production of such alloys by powder metallurgy (PM) starting from elemental powders has the problem of lacking homogeneity due to restricted solid state diffusion. To improve mixing and diffusion of the elements mechanical alloying is used. This paper studies the microstructural characterization and mechanical properties obtained by bending tests of Ti-Nb-(Fe-Cr) alloys obtained by conventional PM with elemental powder mixture and mechanical alloying. The mechanical alloying allows a much more homogeneous composition and particle morphology, characterized by rounded and significantly enlarged powder particles. In the sintered samples two phases appear, namely alpha and beta phase. The α phase appears at the grain boundaries and in lamellae growing from the edge inward, formed mainly by Ti and lower Nb content than nominal. The beta phase is enriched with Nb, Fe and Cr. The addition of the both latter elements increases considerably mechanical properties of Ti-Nb alloys, providing increased ductility.Keywords: beta Ti, Ti-Nb alloys, powder metallurgy, Fe and Cr additions Introduction:Titanium alloys have demonstrated properties attractive for biomedical applications due to their lower modulus, superior biocompatibility and excellent corrosion resistance compared to stainless steels and Co-Cr alloys. Ti6Al4V has been become the most used implant materials, but it is known that V and Al are toxic for the human body 1, 2.  type titanium alloys with lower modulus of elasticity and greater strength have been developed recently and it has been reported that Ti-Nb alloys exhibit complete biocompatibility. The presence of titanium body centered cubic crystal structure ( phase) at room temperature cause a decreasing of elastic modulus, improving the stress shielding problem. Therefore, β titanium alloys are promising materials for bio-applications 3-5. Multicomponent titanium alloys can be divided into , + and -Ti, and usually the equation of Aluminum equivalent (Al eq ) and Molybdenum equivalent (Mo eq ) are applied to define the type of alloy. The effect of Al eq and Mo eq on the strength and fracture toughness of titanium alloys has been studied and the result shows that the tensile strength of the alloy increases with increasing of aluminum equivalent and molybdenum equivalent and the fracture toughness decreases gradually 6, 7. The addition of small amounts of Fe and Cr increase  phase stability, therefore further improving the properties of theTi-Nb alloy. The Molybdenum equivalent can be calculated for Ti-Nb-Fe-Cr alloys in the simplified form:

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“…Ova metoda fiksacije preloma podrazumeva primenu zavrtnja za učvršćivanje nedislociranih ili dislociranih preloma nakon repozicije, a preporučuje se primena kod pacijenta sa dobro očuvanom gustinom koštane mase. [16] [20][1] [6] Kao sredstva za unutrašnju fiksaciju preloma u ovom slučaju koriste se zavrtnji, a kada je reč o intertrohanternim prelomima koriste se i intramedularni klinovi. Sva sredstva za unutrašnju fiksaciju treba da odgovaraju definisanim zahtevima za biomaterijale, pa su nerđajući čelik, legure kobalta i hroma, i legure titana najpodesnije za unutrašnju fiksaciju.…”

Section: Slika 11 Proksimalni Okrajak Butne Kosti: (1) Ilijačna Kosunclassified

Fracture behaviour analysis of artificial hip biomaterials

Čolić¹

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Elastic modulus of biomedical titanium alloys by nano-indentation and ultrasonic techniques—A comparative study

Cited by 149 publications

References 37 publications

XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

XRD and nanoindentation testing of thermo-mechanical processed Ti-29Nb-9Ta-10Zr alloy

Microstructural characterisation of Ti–Nb–(Fe–Cr) alloys obtained by powder metallurgy

Fracture behaviour analysis of artificial hip biomaterials

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