Synthesis and characterisation of a new superelastic Ti–25Ta–25Nb biomedical alloy

Bertrand, Emmanuel; Gloriant, T.; Gordin, D.M.; Vasilescu, Ecaterina; Drob, Paula; Vasilescu, Cora; Drob, Silviu Iulian

doi:10.1016/j.jmbbm.2010.06.007

Cited by 118 publications

(40 citation statements)

References 19 publications

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“…The yield strength of Ti35 is in the upper range of the obtained values for other β-metastable alloys based on similar elements but less alloyed, typically ranging between 200 and 600 MPa, illustrating a moderate solid solution hardening effect. [16,18,23,24] As expected from the chosen alloying design, cyclic stress-strain curves display a double yielding behavior (detailed in Figure 1(b) of the Supplementary material), typically observed in metastable β-alloys. [25,26] This behavior is reflected in the evolution of the normalized work-hardening rate (θ/G, θ = dσ T /dε p ), with the shear modulus G estimated from G/E = 3/8 as experimentally found for polycrystalline metallic materials.…”

Section: Introductionmentioning

confidence: 59%

Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity

Lilensten

Couzinié

Bourgon

et al. 2016

Materials Research Letters

192

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Section: Introductionmentioning

confidence: 59%

Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity

Lilensten

Couzinié

Bourgon

et al. 2016

Materials Research Letters

192

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“…For the synthesis, ultra-pure raw metals, 99.999% pure titanium and 99.9% pure niobium were used, and oxygen and nitrogen were added by using 99.8% pure TiO 2 powder and 99.5% pure TiN powder, respectively. The CCLM process, which limits the contact between the melt and the cold copper crucible, was shown to be an efficient method to melt biocompatible Ti-based alloys possessing a high melting point and to obtain uniform chemical composition without contamination (Bertrand et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Ramarolahy

Castany

Prima

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

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131

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To cite this version:A. Ramarolahy, Philippe Castany, F. Prima, P. Laheurte, Isabelle Péron, et al.. Microstructure and mechanical behavior of superelastic Ti-24Nb-0.5O and Ti-24Nb-0.5N biomedical alloys.Journal AbstractIn this study, the microstructure and the mechanical properties of two new biocompatible superelastic alloys, Ti-24Nb-0.5O and Ti-24Nb-0.5N (at.%), were investigated. Special attention was focused on the role of O and N addition on α ″ formation, supereleastic recovery and mechanical strength by comparison with the Ti-24Nb and Ti-26Nb (at.%) alloy compositions taken as references. Microstructures were characterized by optical microscopy, X-ray diffraction and transmission electron microscopy before and after deformation. The mechanical properties and the superelastic behavior were evaluated by conventional and cyclic tensile tests. High tensile strength, low Young's modulus, rather high superelastic recovery and excellent ductility were observed for both superelastic Ti-24Nb-0.5O and Ti24Nb-0.5N alloys. Deformation twinning was shown to accommodate the plastic deformation in these alloys and only the {332} 113 twinning system was observed to be activated by electron backscattered diffraction analyses.

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“…The tensile tests were followed up to rupture. This mechanical test was used to characterize the superelastic effect due to stressinduced martensitic transformation occurring in this kind of alloy [4]. In addition, we observed that cyclic tensile tested specimens exhibit more twins compared with monotonic tensile tested specimens.…”

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confidence: 95%

Twinning system selection in a metastable β-titanium alloy by Schmid factor analysis

Bertrand

Castany²,

Péron³

et al. 2011

Scripta Materialia

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220

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. Twinning system selection in a metastable β-titanium alloy by Schmid factor analysis. Scripta Materialia, Elsevier, 2011, 64 (12) AbstractElectron backscattering diffraction and Schmid factor analysis were used to study the twinning variant selection in a Ti-25Ta-24Nb (mass%) metastable β-titanium alloy. The two twinning systems {1 1 2} 1 1 1 and {3 3 2} 1 1 3 were observed. For each system the Schmid factor was shown to be a relevant parameter to determine the activated variant.Moreover, selection between the two twinning systems depends on the crystallographic orientation of the grain with respect to the tensile direction.Keywords: Titanium alloy; Electron backscattering diffraction; Twinning; Schmid factor Metastable β-titanium alloys can be elaborated with fully biocompatible β-stabilizer elements such as Ta, Nb, Mo, etc. Their interesting mechanical properties make them good candidates for biomedical applications [1] and [2]. Theses alloys possess a non-ordered bcc structure and are subject to numerous deformation mechanisms: a stress induced martensitic transformation which can lead to a superelastic effect, slip and twinning [3] and [4].Twinning is a common deformation mechanism in materials exhibiting a low stacking fault energy in hcp, fcc or bcc structures. In bcc structures {1 1 2} 1 1 1 is a well-known twinning system, but other twinning systems such as {3 3 2} 1 1 3 have been observed in some metastable alloys subject to a martensitic transformation, like Fe-Ni-C or Fe-Be [5]. In metastable β-titanium alloys both twinning systems {1 1 2} 1 1 1 and {3 3 2} 1 1 3 have been observed, depending on the alloy composition [6] and [7]. Each twinning system can be activated in 12 different ways, termed variants in this paper.The Schmid law is commonly used to predict the activated slip system depending on the tensile direction compared with the crystallographic orientation of the crystal. Selection of the twinning variant can also be predicted by the Schmid law for materials exhibiting hcp or fcc structures, as reported in the literature [8] and [9]. Although it is well known that both slip and twinning occur in bcc titanium alloys, the objective of this paper was to confirm that twinning variant selection in each observed system obeys the Schmid law for a metastable β-titanium alloy (bcc). As several twinning systems can be observed in this kind of alloy a selection parameter between these twinning systems will also be established.The metastable β-alloy composition chosen for this study is Ti-25Ta-24Nb (mass%). The ingot was elaborated by cold crucible levitation melting (CCLM). It underwent homogenization annealing at 950 °C for 20 h, followed by a water quench. Each ingot was then cold rolled (CR = 90%), after which a recrystallization annealing was applied at 850 °C for 0.5 h, followed by a water quench in order to retain the β-phase microstructure at room temperature in its metastable state.Before the recrystallization annealing flat tensile test specimens with a section of 3 × 0.7 mm and a gage len...

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Synthesis and characterisation of a new superelastic Ti–25Ta–25Nb biomedical alloy

Cited by 118 publications

References 19 publications

Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity

Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity

Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Twinning system selection in a metastable β-titanium alloy by Schmid factor analysis

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