Influence of hafnium content on mechanical behaviors of Ti–40Nb–xHf alloys

Hon, Yen-Huei; Wang, J.Y.; Pan, Yung Ning

doi:10.1016/j.matlet.2004.06.009

Cited by 24 publications

(16 citation statements)

References 8 publications

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“…The results showed a significant increase of the tensile strength due to the presence of Hf and the alloys were considered as a favourable choice for biological applications due to a relatively low elastic modulus (65 GPa) [18]. The solidification of Ni-based superalloys containing Hf, Ta and Ti was characterized in another study.…”

Section: Introductionmentioning

confidence: 99%

Properties of anodic oxides grown on a hafnium–tantalum–titanium thin film library

Mardare

Ludwig

Savan

et al. 2014

Science and Technology of Advanced Materials

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A ternary thin film combinatorial materials library of the valve metal system Hf–Ta–Ti obtained by co-sputtering was studied. The microstructural and crystallographic analysis of the obtained compositions revealed a crystalline and textured surface, with the exception of compositions with Ta concentration above 48 at.% which are amorphous and show a flat surface. Electrochemical anodization of the composition spread thin films was used for analysing the growth of the mixed surface oxides. Oxide formation factors, obtained from the potentiodynamic anodization curves, as well as the dielectric constants and electrical resistances, obtained from electrochemical impedance spectroscopy, were mapped along two dimensions of the library using a scanning droplet cell microscope. The semiconducting properties of the anodic oxides were mapped using Mott–Schottky analysis. The degree of oxide mixing was analysed qualitatively using x-ray photoelectron spectroscopy depth profiling. A quantitative analysis of the surface oxides was performed and correlated to the as-deposited metal thin film compositions. In the concurrent transport of the three metal cations during oxide growth a clear speed order of Ti > Hf > Ta was proven.

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Section: Introductionmentioning

confidence: 99%

Properties of anodic oxides grown on a hafnium–tantalum–titanium thin film library

Mardare

Ludwig

Savan

et al. 2014

Science and Technology of Advanced Materials

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“…[20][21][22] Moreover, the Ti alloys present a lower rigidity than other implant materials such as CoCr alloys or stainless steels. [20] Due to the lower elastic modulus exhibited by the b phase of titanium, [23][24][25][26][27] compared with the values presented by the a phase, b-Ti alloys are a relevant field of investigation. However, the b phase in Ti alloys is present at high temperature; hence, in order to stabilize this phase at low temperature and obtain low elastic Ti alloys, nontoxic and nonallergic b-stabilizing alloying elements such as Ta, Nb, Mo, Hf, and, in some cases, Zr as a neutral element are used.…”

Section: Introductionmentioning

confidence: 99%

Study of New Multifunctional Shape Memory and Low Elastic Modulus Ni-Free Ti Alloys

Arciniegas

Manero

Peña

et al. 2008

Metall Mater Trans A

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Two new Ni-free Ti alloys, , have been produced and studied in order to obtain shape memory and low elastic modulus materials for employment in the biomedical field. The new alloys were designed by means of a theoretical molecular orbitals method using nontoxic alloying elements. In the present study, the phases and mechanical properties obtained after solution treatment at 1100°C by 1.5 hours following an ice-water quenching were characterized. Also, special attention on exploring the elastic modulus and shape memory properties via instrumented nanoindentation was given. The microstructural observation revealed b-grain in both alloys with an average size of 268 and 500 lm for Ti-15.7Ta-19.0Nb and Ti-8.8Zr-19.1Nb alloys, respectively. This latter presented also fine and disperse plates inside the grains. X-ray results confirmed the existence of b phase in both alloys and orthorhombic a¢¢ phase on Ti-8.8Zr-19.1Nb alloy. A reversible phase transformation was detected by differential scanning calorimetry in the former alloy, which confirms the presence of shape memory effect. The elastic modulus of the new alloys was smaller than the commercial alloys employed as implant materials. Evidence of phase transformation was detected by nanoindentation, as hysteresis loops between unloading/reloading cycles on the P-h curves obtained at nanometer scale. These results suggest the possibility of using instrumented indentation for shape memory characterization.

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“…The result was in agreement with the literature, where the β phase was entirely retained with Nb contents higher than 30 wt%. 15,27 The additional diffraction peaks of modest intensity belonging to TiH 1.924 appeared as the cathodic current density was higher than 10 ASD. This result indicated that the hydrogen content in a TiNb matrix increased with an increase in the cathodic current density.…”

Section: Resultsmentioning

confidence: 97%

Effects of Surface Functionalization on the Nanostructure and Biomechanical Properties of Binary Titanium-Niobium Alloys

Kuo

Chou²,

Lin³

et al. 2012

J. Electrochem. Soc.

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A porous structural oxide film was formed on titanium-niobium alloys (TiNb) by anodic oxidation after cathodic pretreatment. The effects of titanium hydride compounds on the formation of an oxide film and the structural properties of a TiNb matrix were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nanoindentation. The XRD spectra showed that composite films containing TiH 1.924 were formed by cathodic pretreatment and directly dissolved after anodic oxidation. Consequently, a thick and porous oxide surface was formed on a TiNb matrix, thereby increasing the bioactivity of TiNb. Nano-indentation showed that the elastic modulus of TiNb was reduced until it was close to that of bone tissue. These results showed that TiNb subjected to anodic oxidation after cathodic pretreatment had the potential to promote sufficient load sharing between the bone and the TiNb implant.

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Influence of hafnium content on mechanical behaviors of Ti–40Nb–xHf alloys

Cited by 24 publications

References 8 publications

Properties of anodic oxides grown on a hafnium–tantalum–titanium thin film library

Properties of anodic oxides grown on a hafnium–tantalum–titanium thin film library

Study of New Multifunctional Shape Memory and Low Elastic Modulus Ni-Free Ti Alloys

Effects of Surface Functionalization on the Nanostructure and Biomechanical Properties of Binary Titanium-Niobium Alloys

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