Superior in vitro biocompatibility in NbTaTiVZr(O) high-entropy metallic glass coatings for biomedical applications

Cemin, Felipe; Artico, Leonardo Luís; Piroli, Vanessa; Yunes, José Andrés; Figueroa, Carlos A.; Alvarez, F.

doi:10.1016/j.apsusc.2022.153615

Cited by 27 publications

(23 citation statements)

References 64 publications

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“…Further, the XPS survey spectra in Figure fa show a significant decrease in the O 1s peak compared to the sub-surface (before Ar + plasma etching). Thus, the high-intensity O1s peak before etching is attributed to transition metallic oxides, namely, Nb 5+ (Nb 2 O 5 ), Ta 5+ (Ta 2 O 5 ), Ti 4+ (TiO2), Zr 3+ (Zr 2 O 3 ), Zr 2+ (ZrO 2 ), and Mo 6+ (MoO 3 ). − This high-intensity O1s peak is more clearly explained in Figure f, showing the relative atomic composition, where the surface has a higher percentage of oxygen (55.49%), 17.8 (sub-surface), and 17.9 (bulk), as given in Table S2. The HEA and HEMG alloys were prepared with a similar and nearly equiatomic composition, as given in Table .…”

Section: Resultsmentioning

confidence: 94%

“…The corresponding binding energies are listed in Table S1. The individual electron spectra at the core level before Ar + plasma etching were for the oxidized form . However, the individual spectra were obtained at lower energy states after Ar + plasma etching (during XPS analysis), corresponding to pure metallic conditions .…”

Section: Resultsmentioning

confidence: 99%

“…The higher cell proliferation is also due to the higher Ti and Zr contents on the surface (Figure 11). 26 The high cell viability for HEA and HEMG over CP-Ti can also be attributed to the nontoxic, stable passive layer made of biocompatible elements, namely, Ti, Zr, Nb, Mo, and Ta, which are strongly bonded, thereby avoiding the release of toxic ions. Therefore, HEA and HEMG are also suggested for prospective application to implants (Table 6).…”

Section: Discussionmentioning

confidence: 99%

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Design and Development of High-Entropy Alloys with a Tailored Composition and Phase Structure Based on Thermodynamic Parameters and Film Thickness Using a Novel Combinatorial Target

et al. 2023

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This study presents a novel synthesis route for high-entropy alloys (HEAs) and high-entropy metallic glass (HEMG) using radio frequency (RF) magnetron sputtering and controlling the HEA phase selection according to atomic size difference (δ) and film thickness. The preparation of HEAs using sputtering requires either multitargets or the preparation of a target containing at least five distinct elements. In developing HEA-preparation techniques, the emergence of a novel sputtering target system is promising to prepare a wide range of HEAs. A new HEA-preparation technique is developed to avoid multitargets and configure the target elements with the required components in a single target system. Because of a customizable target facility, initially, a TiZrNbMoTaCr target emerged with an amorphous phase owing to a high δ value of 7.6, which was followed by a solid solution (SS) by lowering the δ value to 5 (≤6.6). Thus, this system was tested for the first time to prepare TiZrNbMoTa HEA and TiZrNbMoTa HEMG via RF magnetron sputtering. Both films were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy, field emission scanning electron microscopy cross-sectional thickness, and atomic force microscopy (AFM). Furthermore, HEMG showed higher hardness 10.3 (±0.17) GPa, modulus 186 (±7) GPa, elastic deformation (0.055) and plastic deformation (0.032 GPa), smooth surface, lower corrosion current density (I corr), and robust cell viability compared to CP-Ti and HEA. XRD analysis of the film showed SS with a body-centered cubic (BCC) structure with (110) as the preferred orientation. The valence electron concentration [VEC = 4.8 (<6.87)] also confirmed the BCC structure. Furthermore, the morphology of the thin film was analyzed through AFM, revealing a smooth surface for HEMG. Inclusively, the concept of configurational entropy (ΔS mix) is applied and the crystalline phase is achieved at room temperature, optimizing the processing by avoiding further furnace usage.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Design and Development of High-Entropy Alloys with a Tailored Composition and Phase Structure Based on Thermodynamic Parameters and Film Thickness Using a Novel Combinatorial Target

et al. 2023

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“…However, it is unclear whether HEMGs will derive these traits from such special compositions. Many studies have reported that HEMGs possess enhanced electrocatalytic activity [2,3] , excellent irradiation tolerance [4] , superior cytocompatibility [5] , and thermoplastic formability [6] , which indicates that HEMGs have great potential for application.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the dynamic descriptors stress the active response to external stimulus, and hence the "defects" may be measured by soft mode [15,16] and vibrational mean squared displacement [17,18] . Compared with conventional single/double element-based MGs, HEMGs show ultrahigh strength [19,20] and enhanced intrinsic ductility [4] . A series of research on creep reported that HEMGs have a smaller serration during plastic flow [21] , a smaller apparent activation volume [19,22,23] , and a slower annihilation of free volume [22] , than conventional MGs.…”

Section: Introductionmentioning

confidence: 99%

Identifying stress-induced heterogeneity in Cu20Zr20Ni20Ti20Pd20 high-entropy metallic glass from machine learning atomic dynamics

Lu¹,

Tu²,

Shen³

2022

J Mater Inf

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High-entropy metallic glasses (HEMGs) are amorphous alloys with a near-equiatomic composition containing at least five elements. Such a unique non-crystalline structure with high configurational entropy of mixing provides HEMGs with promising prospects in applications, and it also attracts great scientific interest. In this paper, we focused on the atomic mechanism of stress-induced heterogeneity in the Cu20Zr20Ni20Ti20Pd20 HEMG. Applying the machine learning (ML) technique combined with the classical molecular dynamics (MD) simulation, we defined the liquid-like active atoms as the ones exhibiting high machine-learned temperature (TML). TML is a parameter to characterize the atomic motion activated by thermal and mechanical stimuli. The results reveal the stress-induced heterogeneity in atomic dynamics during creep. Local plastic flows originate from these active “hot” atoms, which have low five-fold symmetry, low coordination packing, and obvious chemical short-range ordering. Compared with conventional metallic glasses (MGs), the HEMG exhibits a smaller activation volume of creep, fewer active atoms, and sluggish dynamics. The results provide physical insights into the structural and dynamic heterogeneity in HEMGs at an atomic level.

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Atomic Radius Mismatch: A Key Parameter for Design and Synthesis of High‐Entropy Physical Vapor Deposition Coatings—Review

Lotfi‐Khojasteh,

Elmkhah,

Nouri

et al. 2024

Adv Eng Mater

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High‐entropy metal sublattice coatings (HESCs) prepared by physical vapor deposition (PVD) have received attention due to their diverse range of properties and applications. One of the most critical requirements for their synthesis is the prediction and control of their wide‐spread properties, and several efforts have been undertaken using various thermodynamical parameters. The majority of these predictions concentrate on high‐entropy alloys (HEAs) while high‐entropy ceramics (HECs) received little attention. One of the most important parameters to control the structure and properties of HEAs is their atomic radius mismatch (δr), which we apply to crystalline, amorphous, and composite (amorphous matrix, crystalline matrix, and multilayer) HESCs. Based on the relationships between δr and structure, mixing enthalpy (ΔHmix), electronegativity difference (Δχ), ion bonding percentage (IBPHE), mechanical properties (including hardness, H, and Young’s modulus, E), and wear performance descriptors (H/E and H3/E2 ratios) we provide a δr‐based map to aid the design and selection of elements for HESCs.This article is protected by copyright. All rights reserved.

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Superior in vitro biocompatibility in NbTaTiVZr(O) high-entropy metallic glass coatings for biomedical applications

Cited by 27 publications

References 64 publications

Design and Development of High-Entropy Alloys with a Tailored Composition and Phase Structure Based on Thermodynamic Parameters and Film Thickness Using a Novel Combinatorial Target

Design and Development of High-Entropy Alloys with a Tailored Composition and Phase Structure Based on Thermodynamic Parameters and Film Thickness Using a Novel Combinatorial Target

Identifying stress-induced heterogeneity in Cu20Zr20Ni20Ti20Pd20 high-entropy metallic glass from machine learning atomic dynamics

Atomic Radius Mismatch: A Key Parameter for Design and Synthesis of High‐Entropy Physical Vapor Deposition Coatings—Review

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