Influence of Dy in solid solution on the degradation behavior of binary Mg-Dy alloys in cell culture medium

Yang, Lei; Ma, Liangong; Huang, Yuanding; Feyerabend, Frank; Blawert, Carsten; Höche, Daniel; Willumeit‐Römer, Regine; Zhang, Erlin; Kainer, Karl Ulrich; Hort, Norbert

doi:10.1016/j.msec.2017.03.010

Cited by 28 publications

(17 citation statements)

References 35 publications

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“…Consequently, the presence of Nd-poor regions around these lamellar particles could enhance the galvanic corrosion. Similar results were reported by Yang et al, [66] in which the Mg matrix with less Dy content is less corrosion resistant than that enriched with Dy.…”

Section: Corrosion Proceeding Influenced By Intermetallic Microstructuresupporting

confidence: 90%

“…Previous investigations indicated that the solid solution of rare-earth elements in the Mg matrix could increase its corrosion potential. [28,66,67] In addition, the high chemical activity and diffusivity of elements are also beneficial for the corrosion proceeding near grain boundaries. Consequently, the presence of Nd-poor regions around these lamellar particles could enhance the galvanic corrosion.…”

Section: Corrosion Proceeding Influenced By Intermetallic Microstructurementioning

confidence: 99%

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Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Zhang

Huang

Feyerabend

et al. 2020

Metall Mater Trans A

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The influence of intermetallic microstructure on the degradation of Mg-5Nd alloy with different heat treatments was investigated via immersion testing in DMEM + 10 pct FBS under cell culture conditions and subsequent microstructural characterizations. It was found that T4 heat-treated sample had the poorest corrosion resistance due to the lack of finely dispersed precipitates inside grains, continuous lamellar particles along grain boundaries and outer Ca-P layer, and to the formation of a loose corrosion product layer. In contrast, the aged samples exhibited a better corrosion resistance due to their presence and to the formation of a compact corrosion layer. Their degradation behavior largely depended on the intermetallic microstructure. Corrosion was initiated in the matrix around stable globular particles Mg41Nd5 at grain boundaries. In the sample aged at high temperature 245 °C, the coexistence of lamellar Mg41Nd5 particles and their nearby Nd-poor regions enhanced the corrosion. The corrosion first started in such regions. It was shown that those finely dispersed precipitates formed during aging had no influence on the corrosion initiation. However, they indeed affected the subsequent corrosion propagation with the immersion proceeding. They supplied barriers for corrosion propagation and hence were beneficial for improving the corrosion resistance. The continuously distributed lamellar Mg41Nd5 precipitates formed at grain boundaries during aging at 245 °C supplied an additional effective obstacle to corrosion propagation. This was especially beneficial for hindering the corrosion propagation at the later stage of corrosion.

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Section: Corrosion Proceeding Influenced By Intermetallic Microstructuresupporting

confidence: 90%

Section: Corrosion Proceeding Influenced By Intermetallic Microstructurementioning

confidence: 99%

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Zhang

Huang

Feyerabend

et al. 2020

Metall Mater Trans A

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“…electrochemical deposition [15,16], polymer treatment [17,18], chemical deposition [19,20], and micro-arc oxidation (MAO) techniques [21][22][23], have been introduced to improve the degradation rate and bioactivity of magnesium and its alloys [9,24]. As is known, fabrication of magnesium-based composites with bio-ceramic additives [25], besides the surface modification of magnesium implants, and alloying magnesium with biocompatible metals [26,27] are the major techniques to protect the implant from fast corrosion and degradation in vivo. Moreover, bio-additives and suitable coatings can improve the hemocompatibility and bioactivity of implants in this field [11,14,[28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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Abstract:In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO 2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 µm is generated on the Mg/HA/TiO 2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 µm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO 2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH) 2 , HA, Ca 3 (PO 4 ) 2 , and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO 2 nanocomposite after nine days of incubation.

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“…Furthermore, Dy has a positive electrode potential and could form an insoluble Dy 2 O 3 or Dy(OH) 3 film on the surface of the Mg matrix to protect the matrix from being corroded. [23] Therefore, it has the potential to improve the mechanical properties and degradation resistance of the Mg alloy. Lenka and Radim [24] designed and prepared the Mg-10Dy-3Al-1Zn-0.2Zr alloy (mass%) on the basis of the AZ31 and Mg-10Dy alloys, and they found that it could also be considered for biomedical purposes because of its favorable chemical composition.…”

Section: Doi: 101002/adem201901360mentioning

confidence: 99%

“…The Zn and Dy elements were mainly distributed near the second phase. Because their standard electrode potentials (Zn: À0.76 V, Dy: À2.35 V) are higher than that of the Mg matrix (À2.37 V), [23,38] the second phase acts as a cathode phase during microgalvanic corrosion. After soaking in SBF for 24 h, pitting corrosion mainly occurred at the site close to the second phase, and it developed along the network second phase and the particle second phase to the interior of the matrix, as shown in Figure 9c, the formation of Dy 2 O 3 indicates that the Dy element participates during the formation of the protective layer in the alloys.…”

Section: Degradation Propertiesmentioning

confidence: 99%

Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

Wen

et al. 2020

Adv Eng Mater

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As candidates for biomaterials, magnesium and its alloys have promising properties such as biodegradability and biocompatibility. However, their poor mechanical properties and rapid degradation rate limit clinical application; therefore, solving these issues is essential for practical application. Herein, different contents of dysprosium (Dy) (0, 0.5, 1, 1.5, 2, 3 mass%) are added to the Mg–2Zn–0.5Zr biomagnesium alloy to explore its effect on the mechanical and degradation properties. Assessments are conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), immersion, and electrode chemical experiments. The results indicate that the addition of Dy significantly decreases the grain size, and the second phase is (Mg, Dy)7Zn3 with a body‐centered cubic structure. At a Dy content of 1.5 mass%, grain refinement and second‐phase strengthening result in the alloy having relatively good properties, with an ultimate tensile strength (UTS) = 150 ± 14 MPa, yield strength (YS) = 89 ± 3 MPa, and elongation (EL) = 9.2 ± 0.6%. The addition of Dy promotes the formation of a stable protective film and increases the electrode potential of the Mg matrix, resulting in a degradation rate of 0.89 ± 0.12 mm year−1. The results indicate that the alloy with 1.5 mass% Dy content is a promising candidate for using as a biodegradable material.

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Influence of Dy in solid solution on the degradation behavior of binary Mg-Dy alloys in cell culture medium

Cited by 28 publications

References 35 publications

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

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