Microstructural investigation of a rapidly solidified Ti–Zr–Fe–Si–Sn–Nb alloy

Liu, Z.G.; Wang, X.; Wang, X.P.; Zhang, C.J.; Chai, Li; Chen, Y.Y.

doi:10.1016/j.jallcom.2010.04.080

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The addition of Nb in a Ti-Al alloy matrix can act as BCC β-stabilizer in both γ-TiAl and α 2 -Ti 3 Al phases, which leads to the formation of ordered orthorhombic Ti 2 AlNb phases. Moreover, Nb acts as a substitutional or interstitial solute in the crystal lattice matrix [32]. This helps to induce the distortion of the crystal lattice, resulting in a reduction of dislocation movements, which lead to an improvement in the mechanical properties of the alloys [33].…”

Section: Microstructural Resultsmentioning

confidence: 99%

Synthesis of Ti-Al-xNb Ternary Alloys via Laser-Engineered Net Shaping for Biomedical Application: Densification, Electrochemical and Mechanical Properties Studies

Kanyane

Popoola

Pityana³

et al. 2022

Materials

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The lives of many people around the world are impaired and shortened mostly by cardiovascular diseases (CVD). Despite the fact that medical interventions and surgical heart transplants may improve the lives of patients suffering from cardiovascular disease, the cost of treatments and securing a perfect donor are aspects that compel patients to consider cheaper and less invasive therapies. The use of synthetic biomaterials such as titanium-based implants are an alternative for cardiac repair and regeneration. In this work, an in situ development of Ti-Al-xNb alloys were synthesized via laser additive manufacturing for biomedical application. The effect of Nb composition on Ti-Al was investigated. The microstructural evolution was characterized using a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). A potentiodynamic polarization technique was utilized to investigate the corrosion behavior of TiAl-Nb in 3.5% NaCl. The microhardness and corrosion behaviour of the synthesized Ti-Al-Nb alloys were found to be dependent on laser-processing parameters. The microhardness performance of the samples increased with an increase in the Nb feed rate to the Ti-Al alloy system. Maximum microhardness of 699.8 HVN was evident at 0.061 g/min while at 0.041 g/min the microhardness was 515.8 HVN at Nb gas carrier of 1L/min, respectively.

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Section: Microstructural Resultsmentioning

confidence: 99%

Synthesis of Ti-Al-xNb Ternary Alloys via Laser-Engineered Net Shaping for Biomedical Application: Densification, Electrochemical and Mechanical Properties Studies

Kanyane

Popoola

Pityana³

et al. 2022

Materials

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“…Since the faults enhance the heterogeneous nucleation of c-TiAl at grain boundaries, C effectively increases the nucleation rate of c-TiAl, thus resulting in a fine lamellar structure [16]. e addition of B and Y to TiAl alloys serves as grain refining elements [24,47,48]. In good agreement with the Hall-Petch relationship, grain-refined microstructures enhance the mechanical properties of TiAl alloy [24].…”

Section: "Z"-element Additionsmentioning

confidence: 66%

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Cobbinah

Matizamhuka

2019

Advances in Materials Science and Engineering

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A primary challenge associated with TiAl alloys is their low ductility at room temperature. One approach to overcome this flaw is attaining ultrafine grains in the alloy’s final microstructure. The powder metallurgy (PM) processing route favours the synthesising of ultrafine grains in TiAl alloys. This paper features the mechanical alloying (MA) process and rapid consolidation through the spark plasma sintering (SPS) technique, which comprises the PM process. Furthermore, a second approach discussed covers microalloying TiAl alloys. An evaluation of the influence of high oxygen content is also presented, including the formation of α-Al2O3. A section of the review delves into the dynamic recrystallisation mechanisms involved in elevated temperature deformation of TiAl alloys. The final section highlights the efficacy of ternary element additions to TiAl alloys against oxidation.

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“…These results are similar to those reported by other authors. Titanium matrix doped with Fe, Nb and Cr yielded alloys which were mainly characterized by β phase [29][30][31][32] .…”

Section: Microstructural Characteristicsmentioning

confidence: 99%

“…(ii) The β-Ti matrix is associated with high mechanical strength and hardness 30 . (iii) Precipitation of intermetallic phases (Ti 3 Si 5 and TiFe) occurs along the grain boundaries and causes crystallographic misalignment that makes the movement of dislocations difficult 19 .…”

Section: Microhardnessmentioning

confidence: 99%

Fabrication of Ti10Fe5Si5Cr3Nb Composite Coatings on Ti-6Al-4V Alloy using Laser Cladding Technique

et al. 2021

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Ti10Fe5Si5Cr3Nb composite coatings were fabricated using laser cladding technique. Laser power was varied from 800W to 1200W while the scanning speed was kept constant at 1.5 m/min. The microstructural analysis of the samples was conducted by using optical microscope, X-ray diffractometer and scanning electron microscope coupled with energy dispersive spectroscopy. Potentiodynamic polarization and diamond indenter were used to study the corrosion and microhardness properties of the alloy. The alloy exhibited a dendritic microstructure with Si-rich dispersed phase. Grain coarsening was observed to be dependent on coating depth. The microhardness was high at the top and decreased with coating depth. No improvement in corrosion resistance was noticed but the presence of Cr in the alloy promoted passivation.

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Microstructural investigation of a rapidly solidified Ti–Zr–Fe–Si–Sn–Nb alloy

Cited by 4 publications

References 13 publications

Synthesis of Ti-Al-xNb Ternary Alloys via Laser-Engineered Net Shaping for Biomedical Application: Densification, Electrochemical and Mechanical Properties Studies

Synthesis of Ti-Al-xNb Ternary Alloys via Laser-Engineered Net Shaping for Biomedical Application: Densification, Electrochemical and Mechanical Properties Studies

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Fabrication of Ti10Fe5Si5Cr3Nb Composite Coatings on Ti-6Al-4V Alloy using Laser Cladding Technique

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