Atomic structure of the Mg66Zn30Ca4 metallic glass
| Autor: | Zuzana Molčanová, Ildikó Pethes, Pál Jóvári, Karel Saksl, Dagmara Varcholová, Štefan Michalik, M. Šuliková, László Temleitner, Beáta Ballóková, Juraj Ďurišin, Katarína Šuľová, Miloš Fejerčák, Rastislav Motýľ |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Amorphous metal Materials science Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Casting Electronic Optical and Magnetic Materials medicine.anatomical_structure Compressive strength 0103 physical sciences Materials Chemistry Ceramics and Composites medicine engineering Formability Cortical bone Composite material 0210 nano-technology Elastic modulus Dissolution |
| Zdroj: | Journal of Non-Crystalline Solids. 558:120660 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2021.120660 |
| Popis: | Amorphous alloys consisting of elements present in the human body, such as magnesium, zinc and calcium, are currently extensively studied in order to utilize them as a material for biodegradable orthopaedic implants. amongst all Mg-Zn-Ca alloys investigated up to date, the Mg66Zn30Ca4 composition has the greatest potential for applications. Its critical casting thickness reaches a value of 5 mm, the compressive strength (716–854 MPa) is about 4 times the limit of human cortical bone while elastic modulus is (31 GPa) is only 3 times higher than that of human bone. During dissolution the alloy shows only marginal hydrogen evolution. Here we present a detailed, experiment-based structural investigation of Mg66Zn30Ca4. Structural and topological analysis of its atomic structure reveals a high number of predominantly icosahedral densely packed Zn-centred clusters. It is believed that the existence of these structural units is responsible for the suppression of internal diffusion and thus greatly improves glass formability. |
| Databáze: | OpenAIRE |
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