Role of partially amorphous structure and alloying elements on the corrosion behavior of Mg–Zn–Ca bulk metallic glass for biomedical applications

Ramya, M.; Sarwat, Syed Ghazi; Udhayabanu, V.; Subramanian, Selvi; Raj, Baldev; Ravi, K.R.

doi:10.1016/j.matdes.2015.07.154

Cited by 47 publications

(36 citation statements)

References 41 publications

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“…From the EDS results and XRD analysis of corrosion products of MMCs, it can be seen that no new corrosion products are formed after the addition of SiC. It has been reported that the corrosion reactions of Mg alloys immersed in a neutral aqueous solution proceed by the following reactions [33][34][35]: It has been reported that the corrosion reactions of Mg alloys immersed in a neutral aqueous solution proceed by the following reactions [33][34][35]: It has been reported that the corrosion reactions of Mg alloys immersed in a neutral aqueous solution proceed by the following reactions [33][34][35]:…”

Section: Corrosion Behaviormentioning

confidence: 97%

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Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method

Chiu

Liu

2018

Metals

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Low strength, which limits the industrial applications of Mg alloys, can be improved by forming Mg-based metal matrix composites (MMC) reinforced with ceramic particles. In this study, a Mg-based MMC was synthesized by introducing SiC particles into a WZ73 Mg alloy using the stir casting method. The effects of the SiC particles on the mechanical properties and corrosion behavior of WZ73 alloys were studied. The results showed that an addition of 1.5 vol % of SiC enhanced the strength of a WZ73 alloy but reduced the corrosion resistance. A further increase of SiC to 2.5 vol % had no effects on strength and corrosion behavior, which was attributed to the agglomeration of SiC particles. A microstructural analysis indicated that the addition of SiC did not alter the morphology and distribution of the secondary phase in the WZ73 alloy. Thus, the improved strength was attributed to the reinforcement of SiC and the refinement of the Mg grain, while the degraded corrosion resistance was the result of the grain refinement of Mg and the presence of the Mg/SiC interface in the vicinity of the secondary phase, which breaks the continuity of the Mg matrix and results in a higher corrosion rate.

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Section: Corrosion Behaviormentioning

confidence: 97%

“…In addition, the following reactions probably happen on the surface of a Mg alloy when it is immersed in a solution containing Cl − [33,35]:…”

Section: Corrosion Behaviormentioning

confidence: 99%

Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method

Chiu

Liu

2018

Metals

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“…As-cast ingots of higher diameters are only partially amorphous. [ 74 ] More recently, small alloying additions of Sr have been shown to enable an amorphous structure up to 6 mm. [ 69 ] Further exploration of the composition space revealed Ca-rich alloys with signifi cantly increased casting diameters, and improved thermoplastic processing properties, excellent cell proliferation, and increased bone hyperplasia.…”

Section: Glassy Magnesium Alloysmentioning

confidence: 99%

Bulk Metallic Glasses for Implantable Medical Devices and Surgical Tools

et al. 2016

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Their inherent lack of dislocations and hence slip planes leads to exceptionally high strength and elasticity, approaching the theoretical limit. While oxide glasses and ceramics exhibit low toughness and brittle failure, BMGs can display toughness comparable to crystalline metals. [ 2 ] The lack of grain structure means that BMGs are homogeneous and exhibit isotropic behavior, even at sub-micrometer length scales, and, without grain boundaries or precipitates as oxidation sites, corrosion rates are significantly reduced compared to conventional metals.BMGs soften above an alloy-specifi c glass-transition temperature ( T g ) before eventual, time-dependent, crystallization at a higher, crystallization temperature ( T x ). In this supercooled liquid region (SCLR) between T g and T x , the viscous BMGs may be plastically shaped under low applied forces using polymer-processing techniques, such as hot embossing, extrusion, foaming, and injection and blow moulding, before again cooling to a solid metallic glass. With relatively low processing temperatures and no solidifi cation shrinkage, parts can be formed to netshape with excellent accuracy, and geometries, and surface patterns previously diffi cult in metals can be achieved with ease. [3][4][5][6][7] Such remarkable properties and behavior have led to significant interest in BMGs as engineering materials over the past 20 years, but it is only recently that their potential for use as a biomaterial has been studied. [ 8 ] To date, our understanding of material biocompatiblity has evolved mainly through empirical testing, observing the interaction of materials with cells and host tissue in vitro and in vivo. Materials can induce host responses varying from local and systemic infl ammation, hypersensistivity, toxicity, and even tumorogenesis, meaning that thorough evidence of material safety is required before regulatory approval and clinical translation. We now largely recognise the material characteristics that generate both favorable and undesired host responses, as outlined by Williams, [ 9 ] offering the opportunity for informed material design, while being cognisant that biocompatibility is specifi c to the application and host environment. [ 10 ] The original requirement of fi rst generation "biocompatible" materials was bio-inertness. [ 11 ] This included a resistance to corrosion in the body, and here Ti-and Co-based alloys scored highly. [ 12 ] Less-inert metals, such as Mg, were therefore not deemed suitable, although the ions released on dissolution are generally not harmful to the human body. However, current design requirements for biomaterials, including most recently biometals, include eliciting an appropriate host response, [ 13 ] and this can include the need to biodegrade and resorb. There are potential advantages for BMGs that span applications of With increasing knowledge of the materials science of bulk metallic glasses (BMGs) and improvements in their properties and processing, they have started to become candidate materials for biomedical dev...

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“…An improvement in corrosion resistance of Mg alloys has usually been achieved by element alloying, post-processing and surface modification [2][3][4]. Surface modification of Mg alloys includes a variety of approaches: chemical conversion film [5], micro-arc oxidation (MAO) or plasma electrolyte oxidation [6], polymeric coating [7], layer-by-layer film [8] and layered double hydroxide (LDH) coating [9].…”

Section: Introductionmentioning

confidence: 99%

“…LDHs can be represented by the general formula [M 2+ 1´x M 3+ x (OH) 2 ] x+ (A) n´x /2¨m H 2 O, where the cations M 2+ and M 3+ occupy the octahedral holes in a brucite-like layer and the anion A n´i s located in the hydrated interlayer galleries [16]. The because of their many applications as precursors to magnetic materials [17], catalysts [18,19] and anion exchangers [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

Zhang

Zeng

et al. 2016

Metals

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Abstract:Coatings of the Mg(OH) 2 /Mg-Al layered double hydroxide (LDH) composite were formed by a combined co-precipitation method and hydrothermal process on the AZ31 alloy substrate in alkaline condition. Subsequently, a superhydrophobic surface was successfully constructed to modify the composite coatings on the AZ31 alloy substrate using stearic acid. The characteristics of the composite coatings were investigated by means of X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electronic microscope (SEM) and contact angle (CA). The corrosion resistance of the coatings was assessed by potentiodynamic polarization, the electrochemical impedance spectrum (EIS), the test of hydrogen evolution and the immersion test. The results showed that the superhydrophobic coatings considerably improved the corrosion resistant performance of the LDH coatings on the AZ31 alloy substrate.

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Role of partially amorphous structure and alloying elements on the corrosion behavior of Mg–Zn–Ca bulk metallic glass for biomedical applications

Cited by 47 publications

References 41 publications

Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method

Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method

Bulk Metallic Glasses for Implantable Medical Devices and Surgical Tools

Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

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