Investigation of phase equilibria in the Ti-Co-Zr ternary system

Zeng, Yiyu; Zhu, Lilong; Cai, Gemei; Liu, H.S.; Huang, Jiwu; Jin, Zhanpeng

doi:10.1016/j.calphad.2017.02.001

Cited by 13 publications

(2 citation statements)

References 17 publications

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“…The addition of cobalt improves the corrosion resistance of titanium [11] and its mechanical properties [12]. The ternary (Ti–Co)-based alloys also found broad applications [13,14,15,16,17,18]. The Ti–Co alloys are frequently used as coatings on other titanium alloys like Ti6Al4V [19,20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Structural and Mechanical Properties of Ti–Co Alloys Treated by High Pressure Torsion

et al. 2019

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The microstructure and properties of titanium-based alloys can be tailored using severe plastic deformation. The structure and microhardness of Ti–4 wt.% Co alloy have been studied after preliminary annealing and following high pressure torsion (HPT). The Ti–4 wt.% Co alloy has been annealed at 400, 500, and 600 °C, i.e., below the temperature of eutectoid transformation in the Ti–4 wt.% Co system. The amount of Co dissolved in α-Ti increased with increasing annealing temperature. HPT led to the transformation of α-Ti in ω-Ti. After HPT, the amount of ω-phase in the sample annealed at 400 °C was about 8085%, i.e., higher than in pure titanium (about 40%). However, with increasing temperature of pre-annealing, the portion of ω-phase decreased (60–65% at 500 °C and about 5% at 600 °C). The microhardness of all investigated samples increased with increasing temperature of pre-annealing.

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Section: Introductionmentioning

confidence: 99%

Structural and Mechanical Properties of Ti–Co Alloys Treated by High Pressure Torsion

et al. 2019

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“…As already mentioned, a Zr-35Ti-26Co (wt.%, or Ti 45 Zr 27 Co 28 , respectively) alloy was selected as the filler metal for the alumina/titanium brazing. The composition of the selected alloy was in the range of the probable minimum melting point in the Ti-Zr-Co system [16], which is favorable for brazing a ceramic/metal joint with low, thermally induced residual stresses. Initially, the filler metal was obtained in the form of ingots via argon arc melting using commercially pure titanium, zirconium, and cobalt.…”

Section: Brazingmentioning

confidence: 99%

Microstructure and Defect-Based Fatigue Mechanism Evaluation of Brazed Coaxial Ti/Al2O3 Joints for Enhanced Endoprosthesis Design

et al. 2021

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Alumina-based ceramic hip endoprosthesis heads have excellent tribological properties, such as low wear rates. However, stress peaks can occur at the point of contact with the prosthesis stem, increasing the probability of fracture. This risk should be minimized, especially for younger and active patients. Metal elevations at the stem taper after revision surgery without removal of a well-fixed stem are also known to increase the risk of fracture. A solution that also eliminates the need for an adapter sleeve could be a fixed titanium insert in the ceramic ball head, which would be suitable as a damping element to reduce the occurrence of stress peaks. A viable method for producing such a permanent titanium–ceramic joint is brazing. Therefore, a brazing method was developed for coaxial samples, and two modifications were made to the ceramic surface to braze a joint that could withstand high cyclic loading. This cyclic loading was applied in multiple amplitude tests in a self-developed test setup, followed by fractographic studies. Computed tomography and microstructural analyses—such as energy dispersive X-ray spectroscopy—were also used to characterize the process–structure–property relationships. It was found that the cyclic loading capacity can be significantly increased by modification of the surface structure of the ceramic.

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