Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

Martins, Jaqueline; Araújo, Raul Oliveira de; Nogueira, R. A.; Grandini, Carlos Roberto

doi:10.1515/amm-2016-0011

Cited by 24 publications

(21 citation statements)

References 57 publications

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“…2529) The present P1 peak temperature (260°C, f = 1 Hz) is similar to the peak found by Martins JR in the TMo alloys at 525 K (f = 1 Hz) reported in Ref. 11), in which the peak is attributed to the stress-induced short-range ordering of oxygen complexes around Ti atoms in the metal matrix. Oxygen in Ti-based alloys is difficult to remove even though the heat treatment is conducted at high vacuum.…”

Section: The Relaxation Mechanisms Of Atomic Defects Of P1supporting

confidence: 88%

“…3 to be H wq1 = 1.56 « 0.1 eV and¸0 wq1 = 2.5 © 10 ¹16«0.1 s and those of P2 peak can be calculated to be H wq2 = 2.3 « 0.1 eV and¸0 wq2 = 2.1 © 10 ¹17«0.1 s for the water-quenched Ti5Mo alloy, respectively. Martins J.R. et al 11) found the two internal friction peaks at 460 K and 525 K in TiMo alloys, respectively. The 525 K peak temperature is similar to that of the present P1 peak, and its activation energy is different from that of the present P1 peak.…”

Section: The Internal Friction Of the Timo Alloysmentioning

confidence: 98%

“…In contrast, the ¢-TiMo alloys at high temperatures will form either ¡A (with a hcp structure) or ¡AA (with an orthorhombic structure) or ¢ M (metastable ¢) or their combination, which is dependent on Mo content when they are rapidly cooled. 3,10,11,15) Figure 1 shows the XRD results of the furnace-cooled TiMo alloys. It can be seen that the furnace-cooled TiMo alloys consist of ¡ and ¢ phases.…”

Section: The Phase Constitutions and Microstructures Of Thementioning

confidence: 99%

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The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

Zheng

Yang

et al. 2020

Mater. Trans.

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The relaxation processes correlated to atomic defects were investigated by the internal friction method using a multifunctional internal friction apparatus for TiMo alloys. The microstructures of the TiMo alloys with different Mo content and heat treatments were observed using an optic microscopy and a scanning electronic microscopy. Their phase constitutions were detected by X-ray diffraction (XRD). The ¢ phase increases and ¡ phase decreases in volume with increasing Mo content for the furnace-cooled alloys. Similarly, the ¢ M phase volume increases when Mo content is increased. The two relaxational internal friction peaks, named as P1 for the low temperature peak and P2 for the high temperature peak, respectively, are found on the internal friction temperature dependent curves in the alloys. The two peaks always appear in the present experimental specimens with different Mo content and different heat treatments except for the water quenched Ti24 Mo alloys. The P1 and P2 peaks are all influenced by Mo content and heat treatments and related to phase constitutions and microstructures. The P1 peak height increases with increasing Mo content for the water quenched alloys and the P1 peak temperature is not changed with Mo content. The P2 peak height increases also with increasing Mo content and the P2 peak temperature is raised when Mo content is increased but for the water quenched Ti3Mo and Ti5Mo alloys. Relaxation parameters of P1 peak are H wq1 = 1.56 « 0.1 eV and¸0 wq1 = 2.5 © 10 ¹16«0.1 s and those of P2 peak are H wq2 = 2.3 « 0.1 eV and¸0 wq2 = 2.1 © 10 ¹17«0.1 s for the water-quenched Ti5Mo alloy, respectively. The P1 peak is attributed to the stressinduced short-range ordering of oxygen complexes around Ti atoms in the TiMo alloys. The increase of the P1 peak height with increasing Mo content is attributed to the increase of ¢ phase in volume. The P2 peak is resulted from the interaction of MoO atoms or the reorientation of MoMo atomic pairs by means of vacancies. The MoO interaction is strengthened when Mo content is increased, which results in the increase of both the peak temperature and the activation energy of the P2 peak.

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Section: The Relaxation Mechanisms Of Atomic Defects Of P1supporting

confidence: 88%

Section: The Internal Friction Of the Timo Alloysmentioning

confidence: 98%

Section: The Phase Constitutions and Microstructures Of Thementioning

confidence: 99%

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The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

Zheng

Yang

et al. 2020

Mater. Trans.

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“…An examples of modern beta titanium alloys are Ti-5Mo-5Ag [6], Ti-xMo (x-23%-35wt.%) [5,7], Ti14Zr16Nb [4], Ti23Zr25Nb [4], Ti-6Al-2Nb-2Ta-1Mo [8], Ti-15Mo-Zr [9]. It is worth mentioning that a great effort was put into the research and development of Ti-Mo alloys because of their surgical application [10,11].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Hydrothermal Treatment Surface Functionalization of the Ultrafine-Grained TiMo Alloys for Medical Applications

2020

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Hydroxyapatite (HAp) is the most widely used material for bio coating. The functional layer can be produced by many methods, however, the most perspective by its utility, easy to scale up, and simplicity aspects remains a hydrothermal treatment approach. In this work, an HAp coating was produced by low-temperature hydrothermal treatment on the ultrafine-grain beta Ti-xMo (x = 23, 27, 35 wt.%) alloys. The proposed surface treatment procedure combines acid etching, alkaline treatment (AT), and finally hydrothermal treatment (HT). The uniqueness of the approach relies on the recognition of the influence of the molar concentration of NaOH (5 M, 7 M, 10 M, 12 M) during the alkaline treatment on the growth of hydroxyapatite crystals. Obtained and modified specimens were examined structurally and microstructurally at every stage of the process. The results show that the layer after AT consist of titanium oxide and phases based on sodium with various phase relations dependent on NaOH concentration and base composition. The AT in 7 M and 10 M enables to obtain the HAp layer, which can be characterized as the most developed in terms of thickness and porosity. Finally, selected coated samples were investigated in terms of surface wettability test managed in time relation, which for the results confirm high hydrophilicity of the surfaces. Conducted research shows that the low-temperature hydrothermal processing could be considered for a possible adaptation in the drug encapsulation and delivery systems.

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“…So, the addition of this element to Ti increases the melting point making the processing of the material very difficult, provides low modulus of elasticity and flexural strength 17 . Binary Ti-Mo alloys with up to 20% molybdenum have been the subject of several studies due to their having good mechanical properties and corrosion resistance, β phase predominance and non-cytotoxic behavior 1,[18][19][20][21] . Moreover, the Ti-Mo binary system is considered suitable for use as orthopedic implants, which was standardized by ASTM for this type of application (ASMT 2008).…”

mentioning

confidence: 99%

Development of novel Ti-Mo-Mn alloys for biomedical applications

Lourenço

Cardoso

Sousa

et al. 2020

Sci Rep

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Due to excellent biocompatibility and corrosion resistance, the application of titanium alloys in orthopedic and dental implants has been increasing since the 1970s. However, the elasticity of these alloys as measured by their Young’s modulus is still about two to four times higher than that of human cortical bone. The most widely used titanium alloy for biomedical applications is Ti-6Al-4V, however, previous studies have shown that the vanadium used in this alloy causes allergic reactions in human tissue and aluminum, also used in the alloy, has been associated with neurological disorders. To solve this problem, new titanium alloys without the presence of these elements and with the addition of different elements, usually beta-stabilizers, are being developed. Manganese is a strong candidate as an alloying element for the development of new beta-type titanium alloys, due to its abundance and low cytotoxicity. In this study, Ti-10Mo-5Mn, Ti-15Mo-2.5Mn and Ti-15Mo-5Mn alloys were prepared in an arc furnace, which resulted in an alloy structure clearly showing the predominance of the beta phase with a body-centered cubic crystalline structure. The observed microstructure confirmed the results on the structural characterization of alloys. Measurement of the indirect cytotoxicity of the alloys showed that the extracts of the studied alloys are not cytotoxic for fibroblastic cells.

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Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

Cited by 24 publications

References 57 publications

The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

The Atomic Defect Relaxation Processes in the Ti–Mo Alloys

Low-Temperature Hydrothermal Treatment Surface Functionalization of the Ultrafine-Grained TiMo Alloys for Medical Applications

Development of novel Ti-Mo-Mn alloys for biomedical applications

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