Role of aging induced α precipitation on the mechanical and tribocorrosive performance of a β Ti-Nb-Ta-O orthopedic alloy

Acharya, Srijan; Bahl, Sumit; Dabas, Shaurya Singh; Saad, Hassan; Gopal, Vasanth; Panicker, Arpana Gopi; Manivasagam, Geetha; Suwas, Satyam; Chatterjee, Kaushik

doi:10.1016/j.msec.2019.109755

Cited by 17 publications

(8 citation statements)

References 62 publications

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“…Electrochemical tests revealed good corrosion resistance in SBF of the additively manufactured TNZT parts. The I corr values are similar to those we observed for wrought Ti–Nb–Ta–Zr–O and Ti–Nb–Ta–O alloys tested in a similar manner. , Rao et al reported on the corrosion behavior of the TNZT samples in Hank’s solution and observed stable passive polarization behavior, as observed here. The corrosion rate of the hot-rolled TNZT alloy samples in Hanks’s solution reported by Rao et al was lower than that of hot-rolled CP-Ti, which they attributed to the ability of Nb in stabilizing the surface films.…”

Section: Discussionsupporting

confidence: 91%

“…Donato et al reported good in vitro biocompatibility of the as-cast and heat-treated TNZT alloy. Excellent biocompatibility of the TNZT alloys in terms of effective osteoblast adhesion with no significant impact on cell differentiation, apoptosis, inflammatory response, and biomineralization was also reported by Sun et al We have also observed that wrought Ti–Nb–Ta–Zr–O and Ti–Nb–Ta–O alloys exhibit cytocompatibility that is comparable to that of CP-Ti. − …”

Section: Discussionsupporting

confidence: 71%

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Laser Powder Bed Fusion Additive Manufacturing of a Low-Modulus Ti–35Nb–7Zr–5Ta Alloy for Orthopedic Applications

et al. 2022

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Laser powder bed fusion (L-PBF) was attempted here to additively manufacture a new generation orthopedic β titanium alloy Ti–35Nb–7Zr–5Ta toward engineering patient-specific implants. Parts were fabricated using four different values of energy density (ED) input ranging from 46.6 to 54.8 J/mm3 through predefined laser beam parameters from prealloyed powders. All the conditions yielded parts of >98.5% of theoretical density. X-ray microcomputed tomography analyses of the fabricated parts revealed minimal imperfections with enhanced densification at a higher ED input. X-ray diffraction analysis indicated a marginally larger d-spacing and tensile residual stress at the highest ED input that is ascribed to the steeper temperature gradients. Cellular to columnar dendritic transformation was observed at the highest ED along with an increase in the size of the solidified features indicating the synergetic effects of the temperature gradient and solidification growth rate. Density measurements indicated ≈99.5% theoretical density achieved for an ED of 50.0 J/mm3. The maximum tensile strength of ≈660 MPa was obtained at an ED of 54.8 J/mm3 through the formation of the columnar dendritic substructure. High ductility ranging from 25 to 30% was observed in all the fabricated parts irrespective of ED. The assessment of cytocompatibility in vitro indicated good attachment and proliferation of osteoblasts on the fabricated samples that were similar to the cell response on commercially pure titanium, confirming the potential of the additively manufactured Ti–35Nb–7Zr–5Ta as a suitable material for biomedical applications. Taken together, these results demonstrate the feasibility of L-PBF of Ti–35Nb–7Zr–5Ta for potentially engineering patient-specific orthopedic implants.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 71%

Laser Powder Bed Fusion Additive Manufacturing of a Low-Modulus Ti–35Nb–7Zr–5Ta Alloy for Orthopedic Applications

et al. 2022

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“…The fundamental wear mechanisms of implant degradation are identified as abrasion, adhesion, fatigue, and corrosion. In addition, a third body wear is caused by the hard-eroded debris resulting from the reduction of wear resistance [79,122,134,135]. As implants can protect against wear damage in dry environmental conditions, the tribological performance of biomaterials are therefore measured in a simulated body fluid condition.…”

Section: Influence Of Wear Behavior and Microhardness On Biomaterials Performancementioning

confidence: 99%

Investigation of Coatings, Corrosion and Wear Characteristics of Machined Biomaterials through Hydroxyapatite Mixed-EDM Process: A Review

et al. 2021

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Together, 316L steel, magnesium-alloy, Ni-Ti, titanium-alloy, and cobalt-alloy are commonly employed biomaterials for biomedical applications due to their excellent mechanical characteristics and resistance to corrosion, even though at times they can be incompatible with the body. This is attributed to their poor biofunction, whereby they tend to release contaminants from their attenuated surfaces. Coating of the surface is therefore required to mitigate the release of contaminants. The coating of biomaterials can be achieved through either physical or chemical deposition techniques. However, a newly developed manufacturing process, known as powder mixed-electro discharge machining (PM-EDM), is enabling these biomaterials to be concurrently machined and coated. Thermoelectrical processes allow the migration and removal of the materials from the machined surface caused by melting and chemical reactions during the machining. Hydroxyapatite powder (HAp), yielding Ca, P, and O, is widely used to form biocompatible coatings. The HAp added-EDM process has been reported to significantly improve the coating properties, corrosion, and wear resistance, and biofunctions of biomaterials. This article extensively explores the current development of bio-coatings and the wear and corrosion characteristics of biomaterials through the HAp mixed-EDM process, including the importance of these for biomaterial performance. This review presents a comparative analysis of machined surface properties using the existing deposition methods and the EDM technique employing HAp. The dominance of the process factors over the performance is discussed thoroughly. This study also discusses challenges and areas for future research.

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“…The alloy was chosen because of the biocompatibility of constituent elements and its good wear and corrosion resistance. , While wear and corrosion behavior of several high entropy alloys have been reported, their synergistic effect is not well understood particularly in the physiological environment. Tribo-corrosion response of coatings and bulk materials have been evaluated − but there are no reports for high entropy alloys. The tribo-corrosion response of MoNbTaTiZr in simulated body fluid showed excellent passivity and wear response compared with 304 stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Biocompatible High Entropy Alloys with Excellent Degradation Resistance in a Simulated Physiological Environment

Shittu

Pole

Cockerill

et al. 2020

ACS Appl. Bio Mater.

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Bioimplants are susceptible to simultaneous wear and corrosion degradation in the aggressive physiological environment. High entropy alloys with equimolar proportion of constituent elements represent a unique alloy design strategy for developing bioimplants due to their attractive mechanical properties, superior wear, and corrosion resistance. In this study, the tribo-corrosion behavior of an equiatomic MoNbTaTiZr high entropy alloy consisting of all biocompatible elements was evaluated and compared with 304 stainless steel as a benchmark. The high entropy alloy showed a low wear rate and a friction coefficient as well as quick and stable passivation in simulated body fluid. An increase from room temperature to body temperature showed excellent temperature assisted passivity and nobler surface layer of the high entropy alloy, resulting in four times better wear resistance compared to stainless steel. Stem cells and osteoblast cells displayed proliferation and migratory behavior, indicating in vitro biocompatibility. Several filopodia extensions on the cell periphery indicated early osteogenic commitment, and cell adhesion on the high entropy alloy. These results pave the way for utilizing the unique combination of tribo-corrosion resistance, excellent mechanical properties, and biocompatibility of MoNbTaTiZr high entropy alloy to develop bioimplants with improved service life and lower risk of implant induced cytotoxicity in the host body.

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Role of aging induced α precipitation on the mechanical and tribocorrosive performance of a β Ti-Nb-Ta-O orthopedic alloy

Cited by 17 publications

References 62 publications

Laser Powder Bed Fusion Additive Manufacturing of a Low-Modulus Ti–35Nb–7Zr–5Ta Alloy for Orthopedic Applications

Laser Powder Bed Fusion Additive Manufacturing of a Low-Modulus Ti–35Nb–7Zr–5Ta Alloy for Orthopedic Applications

Investigation of Coatings, Corrosion and Wear Characteristics of Machined Biomaterials through Hydroxyapatite Mixed-EDM Process: A Review

Biocompatible High Entropy Alloys with Excellent Degradation Resistance in a Simulated Physiological Environment

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