Microstructure, mechanical properties, corrosion behavior and cytotoxicity of Mg–Zn–Al–Ca alloys as biodegradable materials

Homayun, Bahman; Afshar, Abdollah

doi:10.1016/j.jallcom.2014.04.059

Cited by 109 publications

(58 citation statements)

References 52 publications

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“…These properties are similar to the properties of a human bone (e.g., density, compressive yield strength, ultimate tensile strength). Magnesium alloy implants are moreover biocompatible and biodegradable [1][2][3][4][5][6][7][8][9][10][11]. As a result of chemical reactions with the biological environment non-toxic corrosion products are created on the surface of the implants.…”

Section: Introductionmentioning

confidence: 99%

“…In the human body the magnesium alloy implants dissolve and are absorbed, which prevents surgical removal of the implants after tissue healing [5,6]. The disadvantage of magnesium and magnesium alloys is their high reactivity at the physiological pH (7.4-7.6) as well as in physiological media containing high concentrations of chloride ions, which could cause rapid disintegration of the implant in the biological environment [7,8]. Furthermore, during the corrosion process of magnesium and its alloys, the release of hydrogen gas may be too fast to be endured by the host tissues [9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys

Tkácz

Doležal

Drábiková

et al. 2017

Metals

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Abstract:The electrochemical corrosion characteristics of AZ31 and AZ61 magnesium alloys were analyzed in terms of potentiodynamic tests and electrochemical impedance spectroscopy. The influence of the solution composition and material surface finish was examined also through the analysis of corrosion products created on the samples' surface after electrochemical measurements in terms of scanning electron microscopy using energy-dispersive spectroscopy. Obtained data revealed the differences in the response of the magnesium alloys to enriched Hank's Balanced Salt Solution-HBSS+ (with Mg 2+ and Ca 2+ ions) and Hank's Balanced Salt Solution-HBSS (without Mg 2+ and Ca 2+ ions). Both examined alloys exhibited better corrosion resistance from the thermodynamic and kinetic point of view in the enriched HBSS+. AZ61 magnesium alloy reached higher values of polarization resistance than AZ31 magnesium alloy in both the used corrosion solutions. Phosphate-based corrosion products were characteristic for the AZ31 and AZ61 alloys tested in the HBSS (without Mg 2+ and Ca 2+ ions). The combination of phosphate-based corrosion products and clusters of MgO and Mg(OH) 2 was typical for the surface of samples tested in the enriched HBSS+ (with Mg 2+ and Ca 2+ ions). Pitting corrosion attack was observed only in the case of enriched HBSS+.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys

Tkácz

Doležal

Drábiková

et al. 2017

Metals

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“…In addition, an evident reduction in strength and a clear increase in ductility could be observed at 150 °C. The improved tensile strength at room temperature and at 150 °C due to 0.09 wt% Ti alloying can be mainly attributed to two aspects: (1) The grain boundary strengthening resulting from the smaller SDAS, according to the Hall-Petch equation, which is supported by a number of findings [19][20][21] . (2) Solid solution strengthening caused by Sn and Zn, and precipitate strengthening caused by the refined thermally stable Mg 2 Sn phases, which can effectively impede mobile dislocation, pin grain boundaries and hinder crack propagation [22][23][24] .…”

Section: Tensile Propertiesmentioning

confidence: 82%

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

et al. 2016

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Owing to their good mechanical properties at room temperature, conventional Mg-Al and Mg-Zn based alloys have attracted great interest. Unfortunately, they have problems associated with lower creep and corrosion resistance, and cannot meet the requirements of key structural components due to the low thermal stability of the main secondary phase at elevated temperatures (>150 °C) [1][2] . Therefore, it is imperative to develop novel Mg alloys with excellent performance at high temperatures.Mg-Sn based alloys have received considerable attention as potential candidates for high performance casting and wrought magnesium alloys with enhanced thermal stability owing to the presence of high melting temperature (T m ≈ 770 °C) Mg 2 Sn particles in the microstructure [3][4] . However, the coarse Mg 2 Sn phase and the dendritic structure are often present in ascast binary Mg-Sn alloys, hindering their industrial application [5] . Consequently, the modification of the Abstract:In this study, the influence of minor titanium (Ti) addition on the microstructure and tensile properties of Mg-8Sn-1Zn based alloys were investigated by means of optical microscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, and tensile tests. The results showed that Ti can decrease the secondary dendrite arm spacing (SDAS). The tensile strength of the Mg-8Sn-1Zn-Ti alloys is initially increased by increasing the Ti content up to 0.09wt.%, but subsequently decreased for further increase of Ti content. The improved tensile properties are attributed to the decreased SDAS and refined Mg 2 Sn phases, as well as the increased fraction of tin (Sn) segregated regions. The tensile fracture surface of the studied alloys shows mixed characteristics of cleavage and quasi-cleavage fracture. Adding Ti does not significantly change the fracture mode of the studied alloys.Key words: Mg-8Sn-1Zn alloy; tensile properties; titanium; tin segregation Micro-alloying can ideally help achieve this goal. The element Ti has been widely used owing to its effectiveness in grain refinement of not only Al-based and Mg-Al alloys, but also of Al-free Mg alloys [6] . Choi et al. [7] reported that a proper control of trace amounts of Ti below the solubility limit has the potential to improve the corrosion resistance of cast Mg-Al alloys by decreasing the grain size and the volume fraction, as well as the size of lamellar (α+β) structures and the divorced eutectic β-phase, with the morphology being transformed from a continuous network structure to a semi-continuous one. Similarly, a study by Candan et al. [8] on AZ91 alloys containing 0.2-0.5wt.% Ti indicated that an improvement in tensile strength can be achieved by introducing Ti to modify the microstructure and refine the grain size. However, until now, only Yang et al. [9] have investigated the effects of minor Ti additions on the ascast microstructure and mechanical properties of Mg-Sn based alloys. The results showed that the addition of 0.1-0.3 wt.% Ti to the Mg-3Sn-2Sr alloy can simulta...

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“…Por otro lado, el magnesio es un elemento encontrado naturalmente en el cuerpo humano, teniendo participación en diferentes reacciones metabólicas y funciones biológicas [15][16][17]. Se almacena en los huesos y su exceso se puede excretar de manera natural por vía urinaria.…”

Section: Saludunclassified

Desarrollo de la industria de aleaciones de magnesio en Colombia - Una oportunidad

Berrio-Betancur

Echeverry‐Rendón

Correa

et al. 2017

DYNA

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Magnesium and its alloys are some of the materials that have had notable growing progress in recent years. This interest in magnesium base alloys is due to both, its physical and mechanical properties, as well as the search for alternatives to less polluting materials. In order to provide an overview of the possibilities that the use of this material has in the domestic industry, this work gives a look at the basic aspects of the material and the processes of obtaining; its most promising applications and with potential to be developed in Colombia. Finally, the authors discuss their research and results on this material, seeking to be employed as inputs for the implementation of processes and products at the commercial level.Keyword: Magnesium; magnesium synthesis; magnesium applications; magnesium sustainability.Desarrollo de la industria de aleaciones de magnesio en ColombiaUna oportunidad ResumenDentro de los materiales que más avance han tenido en las últimas décadas, se encuentran el magnesio y sus aleaciones, cuyo volumen de producción mundial se ha incrementado notoriamente en los últimos años. El creciente interés en el magnesio se debe tanto a sus propiedades físicas y mecánicas como a la búsqueda de alternativas de materiales menos contaminantes. Con el objeto de proporcionar una visión general de las posibilidades que el uso de este material tiene en la industria nacional, en este trabajo se da una mirada a los aspectos básicos del material y de los procesos de obtención del mismo, así como a sus aplicaciones más promisorias y con potencial de ser desarrolladas en Colombia. Para finalizar, los autores discuten sus investigaciones y resultados acerca de este material, buscando su aprovechamiento como insumo para la implementación de procesos y productos a nivel comercial.Palabras clave: magnesio; síntesis de magnesio; aplicaciones del magnesio; sostenibilidad del magnesio.

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Microstructure, mechanical properties, corrosion behavior and cytotoxicity of Mg–Zn–Al–Ca alloys as biodegradable materials

Cited by 109 publications

References 52 publications

Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys

Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

Desarrollo de la industria de aleaciones de magnesio en Colombia - Una oportunidad

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