Effect of the substitutional elements on the microstructure of the Ti-15Mo-Zr and Ti-15Zr-Mo systems alloys

Corrêa, Diego Rafael Nespeque; Vicente, Fábio Bossoi; Araújo, Raul Oliveira de; Lourenço, Mariana Luna; Kuroda, Pedro Akira Bazaglia; Buzalaf, Marília Afonso Rabelo; Grandini, Carlos Roberto

doi:10.1016/j.jmrt.2015.02.007

Cited by 54 publications

(47 citation statements)

References 25 publications

(35 reference statements)

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“…The authors observed that with 6 wt% of molybdenum a small amount of α″ phase begins to form and above 9 wt% of molybdenum, a significant amount of β phase was present. It can be observed that the presence of β-stabilizer elements made zirconium a non-neutral element and pass to act on stabilizing β-phase in the alloy [11,15]. Peaks of α″ phase in Ti-20Zr-2.5Mo and presence of peaks from the β phase in Ti-20Zr-5Mo and Ti-20Zr-7.5Mo alloys are related to the action of zirconium, which together with another β-stabilizer element (in the case molybdenum), acts on β-transus temperature decreases.…”

Section: Resultsmentioning

confidence: 99%

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Effect of molybdenum on structure, microstructure and mechanical properties of biomedical Ti-20Zr-Mo alloys

Kuroda

Buzalaf

Grandini

2016

Materials Science and Engineering: C

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Titanium has an allotropic transformation around 883°C. Below this temperature, the crystalline structure is hexagonal close-packed (α phase), changing to body-centered cubic (β phase). Zirconium has the same allotropic transformation around 862°C. Molybdenum has body-centered cubic structure, being a strong β-stabilizer for the formation of titanium alloys. In this paper, the effect of substitutional molybdenum was analyzed on the structure, microstructure and selected mechanical properties of Ti-20Zr-Mo (wt%) alloys to be used in biomedical applications. The samples were prepared by arc-melting and characterized by x-ray diffraction with subsequent refinement by the Rietveld method, optical and scanning electron microscopy. The mechanical properties were analyzed by Vickers microhardness and dynamic elasticity modulus. X-ray measurements and Rietveld analysis revealed the presence of α' phase without molybdenum, α'+α″ phases with 2.5wt% of molybdenum, α″+β phases with 5 and 7.5wt% of molybdenum, and only β phase with 10wt% of molybdenum. These results were corroborated by microscopy results, with a microstructure composed of grains of β phase and lamellae and needles of α' and α″ phase in intra-grain the region. The hardness of the alloy was higher than the commercially pure titanium, due to the action of zirconium and molybdenum as hardening agents. The samples have a smaller elasticity modulus than the commercially pure titanium.

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Section: Resultsmentioning

confidence: 99%

“…This element is considered neutral to form alloys with titanium. However, it decreases the initial temperature of martensitic α′ transformation [10], and in the presence of another β stabilizer element, it has β stabilizer actuation [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of molybdenum on structure, microstructure and mechanical properties of biomedical Ti-20Zr-Mo alloys

Kuroda

Buzalaf

Grandini

2016

Materials Science and Engineering: C

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“…Moreover, the addition of Mo can decrease Young's modulus and improve the corrosion resistance of the material [12,13]. In previous studies, we have found low Young's modulus (60-80 GPa), high tribocorrosion resistance, and good cell viability in Ti-15Zr-Mo alloys [9,[14][15][16]. In particular, the Ti-15Zr-15Mo alloy displayed the best potential for biomedical application.…”

Section: Introductionmentioning

confidence: 92%

Microstructure and selected mechanical properties of aged Ti-15Zr-based alloys for biomedical applications

Corrêa

Kuroda

Lourenço

et al. 2018

Materials Science and Engineering: C

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In this study, Ti-15Zr-xMo (5, 10, 15, and 20 wt%) alloys were submitted to solution and aging treatments and their effects evaluated in terms of phase composition and selected mechanical properties (Vickers microhardness and Young's modulus) for use as biomedical implants. The solution treatment was performed at 1123 K for 2 h, while aging treatments were carried out at 698 K for 4, 8, and 12 h, followed by water quenching. Phase composition and microstructure were dependent of the heat treatments, with Ti-15Zr-5Mo (α + β type) and Ti-15Zr-10Mo (metastable β type) alloys exhibiting intense α phase precipitation. The α-phase precipitates were related to α″ → α and β → α phase decompositions. The Ti-15Zr-10Mo alloy exhibited an intermediary isothermal ω-phase precipitation after aging for 4 h. Vickers microhardness and Young's modulus values changed gradually with the amount of α phase. Aged Ti-15Zr-15Mo and Ti-15Zr-20Mo alloys presented better combinations of hardness and Young's modulus than CP-Ti and Ti-64 ELI for biomedical applications.

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“…Therefore, alloying these two elements can lead to an improvement in the corrosion and mechanical behaviour of the alloy [89,90]. Any increase of molybdenum may lead to a decrease in β-transus temperature, and Mo has a higher β stabilizing impact on the TZM than Zr [91].…”

Section: Chemical Compositionmentioning

confidence: 99%

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

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The corrosion behaviour of new generation titanium alloys (β-type with low modulus) for medical implant applications is of paramount importance due to their possible detrimental effects in the human body such as release of toxic metal ions and corrosion products. In spite of remarkable advances in improving the mechanical properties and reducing the elastic modulus, limited studies have been done on the electrochemical corrosion behaviour of various types of low modulus titanium alloys including the effect of different beta-stabilizer alloying elements. This development should aim for a good balance between mechanical properties, design features, metallurgical aspects and, importantly, corrosion resistance. In this article, we review several significant factors that can influence the corrosion resistance of new-generation titanium alloys such as fabrication process, body electrolyte properties, mechanical treatments, alloying composition, surface passive layer, and constituent phases. The essential factors and their critical features are discussed. The impact of various amounts of α and β phases in the microstructure, their interactions, and their dissolution rates on the surface passive layer and bulk corrosion behaviour are reviewed and discussed in detail. In addition, the importance of different corrosion types for various medical implant applications is addressed in order to specify the significance of every corrosion phenomenon in medical implants.

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Effect of the substitutional elements on the microstructure of the Ti-15Mo-Zr and Ti-15Zr-Mo systems alloys

Cited by 54 publications

References 25 publications

Effect of molybdenum on structure, microstructure and mechanical properties of biomedical Ti-20Zr-Mo alloys

Effect of molybdenum on structure, microstructure and mechanical properties of biomedical Ti-20Zr-Mo alloys

Microstructure and selected mechanical properties of aged Ti-15Zr-based alloys for biomedical applications

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

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