New Mg-Ca-Zn amorphous alloys: Biocompatibility, wettability and mechanical properties

Paul, Sourav; Ramasamy, Parthiban; Das, Mitun; Mandal, Durbadal; Renk, Oliver; Calin, Mariana; Eckert, J.; Bera, Supriya

doi:10.1016/j.mtla.2020.100799

Cited by 33 publications

(13 citation statements)

References 44 publications

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“…It is well known that the amount of the secondary phases have a pivotal role in the mechanical and corrosion performance of Mg alloys, while lesser quantities of Ca, Zn and Sr have been found to increase the resistance towards biocorrosion of magnesium in physiological solutions 44,59,61,67 . Moreover, increased quantities of these individual elements in magnesium would yield increased amount of secondary phases, that would act as micro‐galvanic cells and would decrease the resistance towards corrosion of magnesium alloys 64,68–70 …”

Section: Resultsmentioning

confidence: 99%

“…13,36,52,78 It was observed that S2 composition had higher compressive strength values as compared to that of S1 composition, which could be attributed to the formation of higher intensity Mg-Ca phase. 67 Additionally, incorporation of Zn into the magnesium matrix, results into possible formation of ordered structure in the alloy system. 40,55,79 The addition of zinc in Mg-Ca system also leads to the properties.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…In the alloyed samples of compositions S1 and S2, after 1 day of sample immersion, phases of Ca 2 Mg 6 Zn 3 , (steady intermetallic phase) were found at 32.5 (211) and at 48.2 (231). The other secondary phases, such as MgZn 2 were found at 44.5 (004) and at 63.8 (213) at 68.9 (205) and phases of SrMg 2 were found at 57.6 (220) and that of Mg 23 Sr 6 were found at 71.4 (111)It is well known that the amount of the secondary phases have a pivotal role in the mechanical and corrosion performance of Mg alloys, while lesser quantities of Ca, Zn and Sr have been found to increase the resistance towards biocorrosion of magnesium in physiological solutions 44,59,61,67. Moreover, increased quantities of these individual elements in magnesium would yield increased amount of secondary phases, that would act as micro-galvanic cells and would decrease the resistance towards corrosion of magnesium alloys 64,[68][69][70].…”

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Bioactive fluorcanasite reinforced magnesium alloy‐based porous bio‐nanocomposite scaffolds with tunable mechanical properties

et al. 2022

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Magnesium (Mg) alloy-based porous bio-nanocomposite bone scaffolds were developed by powder metallurgy route. Selective alloying elements such as calcium (Ca), zinc (Zn) and strontium (Sr) were incorporated to tune the mechanical integrity while, bioactive fluorcanasite nano-particulates were introduced within the alloy system to enhance the bone tissue regeneration. Green compacts containing carbamide were fabricated and sintered using two-stage heat treatment process to achieve the targeted porosities. The microstructure of these fabricated magnesium alloy-based bio-nanocomposites was examined by Field emission scanning electron microscope (FE-SEM) and x-ray micro computed tomography (x-ray μCT), which revealed gradient porosities and distribution of alloying elements. X-ray diffraction (XRD) studies confirmed the presence of major crystalline phases in the fabricated samples and the evolution of the various combinations of intermetallic phases of Ca, Mg, Zn and Sr which were anticipated to enhance the mechanical properties. Further, XRD studies revealed the presence of apatite phase for the immersed samples, a conducive environment for bone regeneration. The fabricated samples were evaluated for their mechanical performance against uniaxial compression load. The tunability of compressive strengths and modulus values could be established with variation in porosities of fabricated samples. The retained compressive strength and Young's modulus of the samples following immersion in phosphate buffered saline (PBS) solution was found to be in line with that of natural human cancellous bone, thereby establishing the potential of the fabricated magnesium-alloy-based nanocomposite as a promising scaffold candidate for bone tissue engineering.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

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confidence: 99%

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Bioactive fluorcanasite reinforced magnesium alloy‐based porous bio‐nanocomposite scaffolds with tunable mechanical properties

et al. 2022

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“…Lastly, we want to emphasize that particularly large BMGs can be fabricated by AM techniques and from marginal glass-forming compositions. Specific examples could be, for instance, biocompatible Mg- and Ti-based alloys not containing elements harmful to the human body, but in turn required for enhanced glass-forming ability [ 38 , 39 , 40 , 41 ]. Since TPF not only permits shaping the whole volume of the BMG specimen, but also solely embossing its surface, micro- to nanostructured patterns can be generated [ 24 ], which involve programming a desirable cell response [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

Viscous Flow of Supercooled Liquid in a Zr-Based Bulk Metallic Glass Synthesized by Additive Manufacturing

2020

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The constraint in sample size imposed by the critical cooling rate necessary for glass formation using conventional casting techniques is possibly the most critical limitation for the extensive use of bulk metallic glasses (BMGs) in structural applications. This drawback has been recently overcome by processing glass-forming systems via additive manufacturing, finally enabling the synthesis of BMGs with no size limitation. Although processing by additive manufacturing allows fabricating BMG objects with virtually no shape limitation, thermoplastic forming of additively manufactured BMGs may be necessary for materials optimization. Thermoplastic forming of BMGs is carried out above the glass transition temperature, where these materials behave as highly viscous liquids; the analysis of the viscosity is thus of primary importance. In this work, the temperature dependence of viscosity of the Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glass fabricated by casting and laser powder bed fusion (LPBF) is investigated. We observed minor differences in the viscous flow of the specimens fabricated by the different techniques that can be ascribed to the higher porosity of the LPBF metallic glass. Nevertheless, the present results reveal a similar overall variation of viscosity in the cast and LPBF materials, which offers the opportunity to shape additively manufactured BMGs using already developed thermoplastic forming techniques.

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“…Figure 4 shows the results of XRD tests for both the ribbon and the ingot of the Mg 72 Zn 24 Ca 4 alloy. The ribbon has an amorphous structure with a small amount of the MgZn 2 intermetallic phase, while the ingot is characterized by a crystalline structure [ 45 , 46 ]. Figure 5 presents MgZn and CaZn 13 phase for the ribbon of Zn 87 Mg 9 Ca 4 alloy after the melt spinning process.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Resistance of Mg72Zn24Ca4 and Zn87Mg9Ca4 Alloys for Application in Medicine

et al. 2020

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The aim of this work was to monitor the corrosion rate of the Mg72Zn24Ca4 and Zn87Mg9Ca4 alloys. The purity of the alloying elements was 99.9%. The melt process was carried out in an induction furnace. The melting process took place under the cover of an inert gas (argon). The copper form was flooded by liquid alloy. Then, in order to obtain ribbons, the cast alloy, in rod shape, was re-melted on the melt spinning machine. The corrosion resistance of both alloys has been determined on the basis of the following experiments: measurements of the evolution of OCP (open circuit potential), LSV (linear sweep voltamperometry) and EIS (electrochemical impedance spectroscopy). All corrosion tests were carried out in Ringer’s solution at 37 °C and pH 7.2. The corrosion tests have revealed that the zinc alloy, Zn87Mg9Ca4, exhibits significantly higher corrosion resistance in the Ringer solution compared to the magnesium alloy, Mg72Zn24Ca4. Moreover, it has been shown that the cathodic reaction proceeds faster on the surface of ribbons. EIS measurements show that the dissolution of Mg alloy proceeds with two steps: transfer of Mg2+ ions to the Ringer solution and then the formation of the corrosion products, which are deposited on the surface of magnesium alloy. It has been revealed, too, that for both bulk materials, diffusion of chloride ions through the corrosion product’s layer takes place.

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New Mg-Ca-Zn amorphous alloys: Biocompatibility, wettability and mechanical properties

Cited by 33 publications

References 44 publications

Bioactive fluorcanasite reinforced magnesium alloy‐based porous bio‐nanocomposite scaffolds with tunable mechanical properties

Bioactive fluorcanasite reinforced magnesium alloy‐based porous bio‐nanocomposite scaffolds with tunable mechanical properties

Viscous Flow of Supercooled Liquid in a Zr-Based Bulk Metallic Glass Synthesized by Additive Manufacturing

Corrosion Resistance of Mg72Zn24Ca4 and Zn87Mg9Ca4 Alloys for Application in Medicine

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