Passive film formation on the new biocompatible non-equiatomicTi21Nb24Mo23Hf17Ta15 high entropy alloy before and after resting in simulated body fluid

Roche, Virginie; Champion, Yannick; Батаев, И. А.; Jorge, Alberto Moreira

doi:10.1016/j.corsci.2022.110607

Cited by 13 publications

(2 citation statements)

References 103 publications

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“…The observed low values for the current density plateaus may be ascribed to the controlled mass transport through the oxide layer. 97) In all cases, the different protective coatings appear to be already protecting surfaces at their very early formation stages, 97,98) marked by the lack of an active region in which the current density is more elevated than the passivation plateau current density, observed in the case of stainless steels subjected to an acidic media. Hence, the corrosion current density ( j corr ) was evaluated as the current density at the passivation plateau ( j pass ), as in Refs.…”

Section: Corrosion Resistancementioning

confidence: 99%

Nanostructuring Ti-Alloys by HPT: Phase Transformation, Mechanical and Corrosion Properties, and Bioactivation

et al. 2023

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Due to their unique properties, titanium (Ti) and Ti-alloys are particularly suitable for biomedical devices. Ti has a high specific strength and low Young's modulus (reducing stress shielding), high corrosion resistance, and superior biocompatibility. However, Ti's moderately low Young's modulus (100110 GPa) is still considerably higher than to bones (530 GPa). The ¢-Ti phase, whose elastic modulus is closer to the bone, can be kept by increasing the contents of non-toxic ¢ stabilizing elements. Besides stress shielding and corrosion resistance, adjusted bioactivity (bone-bonding ability) is another primary prerequisite for implants that can be improved by ultrafine-grained (UFG) microstructures and surface modification (anodization and acid+alkaline treatment). UFG by HPT also enhances wear resistance and mechanical properties. Representative alloys (Ti6Al7Nb (TAN), Ti13Nb13Zr (TNZ), and Ti35Nb7Zr5Ta (TNZT)) and cp-Ti, were presented in this overview. Samples started with different phases and morphologies. Deformation by HPT induced phase transformation in the alloys, which depended on the amounts of ¡ or ¢ stabilizers, the strain rate, applied loads, and starting phases and ¡ morphologies. Grain sizes were reduced to about 120 nm. Mechanical properties depended mainly on the number of grain boundaries and their nature and different phases, sizes, and strengths. Young's modulus diminished when the ¢ was increased. Polished surfaces and cp-Ti presented similar corrosion resistance, improved by surface treatments, which reached maximum protection in anodized samples processed by HPT. After bioactivity tests, different growth rates for various processing conditions and alloys were observed, the highest for the TNZ alloy, and improved after HPT processing.

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Section: Corrosion Resistancementioning

confidence: 99%

Nanostructuring Ti-Alloys by HPT: Phase Transformation, Mechanical and Corrosion Properties, and Bioactivation

et al. 2023

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“…Multicomponent alloys have transcended the constraints of traditional alloy design principles, expanding their compositional range into the central regions of the multicomponent phase diagram [1][2][3]. High-entropy alloys (HEAs), a subset of multicomponent alloys, are typically composed of four or more alloying elements in equiatomic or near-equiatomic ratios.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Hardness, Wear Resistance, and Corrosion Resistance of As-Cast and Laser-Deposited FeCoNiCrAl0.8Cu0.5Si0.5 High Entropy Alloy

Ji,

Zhou,

2024

Coatings

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FeCoNiCrAl0.8Cu0.5Si0.5 high-entropy alloys were fabricated using vacuum induction melting and laser deposition processes, followed by a comparison of the structural and mechanical properties of two distinct sample types. The as-cast FeCoNiCrAl0.8Cu0.5Si0.5 alloy is comprised of BCC1, BCC2, and Cr3Si phases, while the laser-deposited alloy primarily features BCC1 and BCC2 phases. Microstructural analysis revealed that the as-cast alloy exhibits a dendritic morphology with secondary dendritic arms and densely packed grains, and the laser-deposited alloy displays a dendritic structure without the formation of granular interdendritic regions. For mechanical properties, the as-cast FeCoNiCrAl0.8Cu0.5Si0.5 alloy demonstrated higher hardness than the as-deposited alloy, with values of 586 HV0.2 and 557 HV0.2, respectively. The wear rate for the as-cast alloy was observed at 3.5 × 10−7 mm3/Nm, with abrasive wear being the primary wear mechanism. Conversely, the as-deposited alloy had a wear rate of 9.0 × 10−7 mm3/Nm, characterized by adhesive wear. The cast alloy exhibited an icorr of 4.062 μA·cm−2, with pitting as the form of corrosion. The laser-deposited alloy showed an icorr of 3.621 μA·cm−2, with both pitting and intergranular corrosion observed. The laser-deposited alloy demonstrated improved corrosion resistance. The investigation of their microstructure and mechanical properties demonstrates the application potential of FeCoNiCrAl0.8Cu0.5Si0.5 alloys in scenarios requiring high hardness and enhanced wear resistance.

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Multifunctional bioactive coating on biomedical β-Ti12Mo6Zr2Fe alloy to improve corrosion protection and bioactivity properties

da Rocha,

Lopes,

Travessa

et al. 2024

Applied Surface Science

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Passive film formation on the new biocompatible non-equiatomicTi21Nb24Mo23Hf17Ta15 high entropy alloy before and after resting in simulated body fluid

Cited by 13 publications

References 103 publications

Nanostructuring Ti-Alloys by HPT: Phase Transformation, Mechanical and Corrosion Properties, and Bioactivation

Nanostructuring Ti-Alloys by HPT: Phase Transformation, Mechanical and Corrosion Properties, and Bioactivation

Microstructure, Hardness, Wear Resistance, and Corrosion Resistance of As-Cast and Laser-Deposited FeCoNiCrAl0.8Cu0.5Si0.5 High Entropy Alloy

Multifunctional bioactive coating on biomedical β-Ti12Mo6Zr2Fe alloy to improve corrosion protection and bioactivity properties

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