Anelastic relaxation associated to phase transformations and interstitial atoms in the Ti–35Nb–7Zr alloy

Chaves, J.M.; Florêncio, Odila; Silva, P.S.; Marques, Pedro; Schneider, S.

doi:10.1016/j.jallcom.2014.07.159

Cited by 18 publications

(10 citation statements)

References 32 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This heightened mobility may be a result of the low atomic radius of the Mo that allows it to increase /s for oxygen and nitrogen in the Ti-15Mo alloy, with the values dependent to the interstitial concentrations. Therefore, this study supports the assumption that the interstitial diffusivity and relaxation time depend on the interstitial and substitutional contents of the alloy 11,20 .…”

supporting

confidence: 88%

Mechanical Spectroscopy of Ti-15Zr-based Alloys with Mo Addition

2017

View full text Add to dashboard Cite

In this paper, the effect of substitutional Mo amounts in internal friction and interstitial diffusion mechanisms was analyzed in Ti-15Zr-based alloys. Mechanical spectroscopy was obtained from room temperature up to 730 K with frequencies between 1 Hz and 40 Hz. Internal friction spectra were composed by anelastic relaxation peaks in β-type alloys (metastable and stable), due to stress-induced ordering of oxygen and nitrogen interstitially in octahedral sites of the bcc crystalline structure. Peak decomposition analysis exhibited interactions between matrix-interstitial (Ti-O and Ti-N), substitutionalinterstitial (Zr-O, Mo-O and Mo-N), and clusters (Ti-O-O and Zr-O-O). The diffusion results showed that the introduction of Mo facilitates the diffusion of interstitial elements in the metallic matrix.

show abstract

supporting

confidence: 88%

Mechanical Spectroscopy of Ti-15Zr-based Alloys with Mo Addition

2017

View full text Add to dashboard Cite

show abstract

“…10. As reported in several papers on oxygen internal friction peak in Ti-Nb based bcc alloys [47][48][49][50][51] , the width of the peak is almost double of the single Debye peak and so the peak should be composed of several components. For binary Ti-Nb bcc alloys, Florêncio et al 47) and Almeida et al 48) decomposed the wide peaks into six components, and Yin et al 49) into four components.…”

Section: Contribution Of Oxygen Interstitialsmentioning

confidence: 79%

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

et al. 2016

View full text Add to dashboard Cite

Single crystals and cold-swaged polycrystalline specimens of Gum Metal of Ti-36Nb-2Ta-3Zr-0.3O (mass %) have been compressed with the stress-relaxation test in the temperature range from 77 K to 450 K. In both single crystals and cold-swaged specimens, the yield stress decreases with increasing temperature rapidly to the room temperature and then gently above it forming a plateau at high temperature. The activation analysis of plastic deformation showed that the applied shear stress dependence of activation enthalpy and that of activation volume for single crystals and those for cold swaged specimens are almost identical if we shift the stress scale by about 120 MPa, meaning that the basic deformation mechanism is common to both samples. The above results are contradictory with the previously proposed non-dislocation deformation mechanism at the ideal shear strength, but consistent with the established features of usual bcc alloys, i.e., the deformation is governed by the Peierls mechanism at low temperature and by defect hardening at high temperature. τ χ − χ and ψ − χ relations of single crystals showed a typical slip asymmetry seen in bcc metals, where slip in Gum Metal belongs to the {112} slip type as in binary Ti-Nb single crystals reported previously (S. Hanada et al.: Metall. Trans. A 16 (1985) 789). Yielding by massive {332}〈113〉 twin formation in single crystals at low temperatures was observed for the rst time in Gum Metal.

show abstract

“…In this work, biomedical composites of Ti-Nb-Zr with different CPP contents (5,10,15, and 20 wt%) were fabricated by milling for 10 h and then sintered by SPS technique, which was suitable for hard tissue implant to shun stress shielding and bio-inert. The following conclusions can be drawn:…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, tissue reaction studies have identified that Ti, Nb, and Zr elements are non-toxic and non-allergenic and will not cause any dangerous reactions in the human body [8,9]. The elastic modulus of Ti-35Nb-7Zr alloy is about 54 GPa [10], and this value is much closer to that of human bones. So the Ti-Nb-Zr alloys have been regarded as one of the most promising biomaterials.…”

Section: Introductionmentioning

confidence: 99%

Characterizations on Mechanical Properties and In Vitro Bioactivity of Biomedical Ti–Nb–Zr–CPP Composites Fabricated by Spark Plasma Sintering

Zhang

Wenrui

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

To alleviate the bio-inert of Ti alloys as hard tissue implants, Ti-35Nb-7Zr-xCPP (calcium pyrophosphate, x = 5, 10, 15, 20 wt%) composites were prepared by mechanical alloying (MA) and following spark plasma sintering (SPS). Mechanical behaviours and in vitro bioactivity of these composites were investigated systematically. Results showed that the composites consisted of b-Ti matrix, a-Ti, and metal-ceramic phases such as CaO, CaTiO 3 , CaZrO 3 , and Ti x P y . With increasing CPP content, the composites had higher strength (over 1500 MPa) and higher elastic modulus, but suffered almost zero plastic deformation together with lower relative density. When the CPP contents were 5 and 10 wt%, the compressive elastic moduli were 44 and 48 GPa, respectively, which were close to those of natural bones. However, the compressive elastic modulus of the composites increased significantly when CPP contents exceed 10 wt%, thus deteriorating the mechanical compatibility of the composites owing to more a-Ti and metal-ceramic phases. Besides, the surface of Ti-35Nb-7Zr-10CPP composite was deposited as a homogeneous apatite layer during soaking in simulated body fluid (SBF). It indicates a good bioactivity between the implant materials and living bones.

show abstract

Anelastic relaxation associated to phase transformations and interstitial atoms in the Ti–35Nb–7Zr alloy

Cited by 18 publications

References 32 publications

Mechanical Spectroscopy of Ti-15Zr-based Alloys with Mo Addition

Mechanical Spectroscopy of Ti-15Zr-based Alloys with Mo Addition

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

Characterizations on Mechanical Properties and In Vitro Bioactivity of Biomedical Ti–Nb–Zr–CPP Composites Fabricated by Spark Plasma Sintering

Contact Info

Product

Resources

About