New (FeCoCrNi)-(B,Si) high-entropy metallic glasses, study of the crystallization processes by X-ray diffraction and Mössbauer spectroscopy.
The role of B and Si in the formation of (FeCoCrNi) 100-x-y B x Si y high-entropy metallic glasses is studied. It is found that a content of B between 10 and 20 at% and of Si between 5 and 15 at% is able to produce a completely amorphous structure. The microstructural evolution of two of this high-e...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/334679 |
| Acceso en línea: | https://hdl.handle.net/2117/334679 https://dx.doi.org/10.1016/j.jnoncrysol.2020.120301 |
| Access Level: | acceso abierto |
| Palabra clave: | Mössbauer spectroscopy Metallic glasses Rapid-solidification Microstructure High entropy alloys Espectroscòpia Mössbauer Vidres metàl·lics Àrees temàtiques de la UPC::Física |
| Sumario: | The role of B and Si in the formation of (FeCoCrNi) 100-x-y B x Si y high-entropy metallic glasses is studied. It is found that a content of B between 10 and 20 at% and of Si between 5 and 15 at% is able to produce a completely amorphous structure. The microstructural evolution of two of this high-entropy metallic glass compositions, (FeCoCrNi) 80 B 20 and (FeCoCrNi) 80 B 10 Si 10 , have been studied by X-ray diffraction and Transmission Mössbauer Spectroscopy. In both compositions, the first crystallization process corresponds to the formation of metastable, M 3 B, and stable, M 2 (B,Si), borides where M stands for metallic atoms. In the Si containing sample a BCC phase also appears. At the second crystallization stage the metastable and the BCC phases disappear and stable M 2 B or M 2 (B,Si) phases begin to grow simultaneously with an FCC structure that presents a distribution of possible environs. The fully crystallized structure consists of boride and silicide phases and a paramagnetic FCC phase. The presence of Si promotes the crystallization of a BCC phase and the refinement of the microstructure leading to smaller and more uniform grains. |
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