Electron-band theory inspired design of magnesium–precious metal bulk metallic glasses with high thermal stability and extended ductility

Laws, Kevin J.; Shamlaye, Karl F.; Granata, Davide; Koloadin, Leah S.; Löffler, Jörg F.

doi:10.1038/s41598-017-03643-7

Cited by 9 publications

(3 citation statements)

References 48 publications

(100 reference statements)

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“…Although, in our previous study of a similar alloy (cast Mg0.8Ca) a formation of Mg2Ca phase was confirmed [25]. Most of the diffraction peaks of Mg0.6Ca2Ag were the same as those for Mg0.6Ca except that there were small peaks in a low 2θ angles region corresponding to binary and ternary intermetallic phases as Mg2Ca, MgAg4, Mg54Ag17 [25,36,43] and Ca2MgAg3 (Figure 7, inset). A further systematic TEM and electron diffraction study would be necessary in order to confirm the presence of these phases.…”

Section: Alloymentioning

confidence: 70%

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

et al. 2019

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Bioactive Plasma Electrolytic Oxidation (PEO) coatings enriched in Ca, P and F were developed on Mg0.6Ca and Mg0.6Ca2Ag alloys with the aim to impede their fast degradation rate. Different characterization techniques (SEM, TEM, EDX, SKPFM, XRD) were used to analyze the surface characteristics and chemical composition of the bulk and/or coated materials. The corrosion behaviour was evaluated using hydrogen evolution measurements in Simulated Body Fluid (SBF) at 37 °C for up to 60 days of immersion. PEO-coated Mg0.6Ca showed a 2–3-fold improved corrosion resistance compared with the bulk alloy, which was more relevant to the initial 4 weeks of the degradation process. In the case of the Mg0.6Ag2Ag alloy, the obtained corrosion rates were very high for both non-coated and PEO-coated specimens, which would compromise their application as resorbable implants. The amount of F− ions released from PEO-coated Mg0.6Ca during 24 h of immersion in 0.9% NaCl was also measured due to the importance of F− in antibacterial processes, yielding 33.7 μg/cm2, which is well within the daily recommended limit of F− consumption.

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Section: Alloymentioning

confidence: 70%

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

et al. 2019

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“…It is noted from the stress–strain curves (Fig. 1e–g) that the elastic limits of the metamaterials (except for the P-NM) are ~10%, which is much greater than the elastic limits of polycrystalline bulk metals (<0.3%) 24,27 , perfect crystalline metals (~5%) 28 , and amorphous alloys (2–3%) 28 . Of particular interest is that the values of E of the NMs are similar, whereas μ differs significantly depending on the type of metamaterial.…”

Section: Resultsmentioning

confidence: 89%

Peculiar elastic behavior of mechanical metamaterials with various minimal surfaces

Park

Lee

2019

Sci Rep

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Molecular dynamics simulations were performed on nanostructured metamaterials (NMs) with gyroid, diamond, and primitive structures to evaluate their mechanical behavior, especially elastic properties. Unlike the constant nature of Young’s ( E ) and shear (μ) moduli of bulk materials, the values of both E and μ of NMs change with relative density and cell size but at different rates depending on the morphologies of the structure. This is particularly the case for μ; for a given relative density and cell size of NMs, the μ values differ greatly, depending on the types of structure, causing the NMs to display differing μ/ E values and thus resistance to shear deformation. The mechanistic origin of this observation was analyzed by resolving the morphologies of the NMs in terms of the numbers and orientations of the fundamental structural motifs for constructing metamaterials.

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“…Based on these limits, we propose Ag-Yb and Mg-Eu as the potential to form metallic glasses with the highest confidence. While Ag and Yb have been used as alloying elements in multicomponent metallic glass systems to a successful degree and the scope and applications of Mg based metallic glass systems has been extensively studied 42–44 , their binary compositions predicted here have not yet been studied for GFA. The binaries Ag-Pr, Be-Fe, Ag-Yb, Mg-Eu, Ag-Te and Ag-Sm are also proposed with confidence to form bulk metallic glasses.…”

Section: Discussionmentioning

confidence: 99%

Probabilistic Assessment of Glass Forming Ability Rules for Metallic Glasses Aided by Automated Analysis of Phase Diagrams

Dasgupta¹,

Broderick²,

Mack³

et al. 2019

Sci Rep

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The use of machine learning techniques to expedite the discovery and development of new materials is an essential step towards the acceleration of a new generation of domain-specific highly functional material systems. In this paper, we use the test case of bulk metallic glasses to highlight the key issues in the field of high throughput predictions and propose a new probabilistic analysis of rules for glass forming ability using rough set theory. This approach has been applied to a broad range of binary alloy compositions in order to predict new metallic glass compositions. Our data driven approach takes into account not only a broad variety of thermodynamic, structural and kinetic based criteria, but also incorporates qualitative and descriptive attributes associated with eutectic points in phase diagrams. For the latter, we demonstrate the use of automated machine learning methods that go far beyond text recognition approaches by also being able to interpret phase diagrams. When combined with structural descriptors, this approach provides the foundations to develop a hierarchical probabilistic predication tool that can rank the feasibility of glass formation.

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Electron-band theory inspired design of magnesium–precious metal bulk metallic glasses with high thermal stability and extended ductility

Cited by 9 publications

References 48 publications

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

Peculiar elastic behavior of mechanical metamaterials with various minimal surfaces

Probabilistic Assessment of Glass Forming Ability Rules for Metallic Glasses Aided by Automated Analysis of Phase Diagrams

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