Direct observation of nanocrystal-induced enhancement of tensile ductility in a metallic glass composite
| Autor: | Andrew M. Minor, Denise Beitelschmidt, Jürgen Eckert, Christoph Gammer, Christian Rentenberger |
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| Rok vydání: | 2021 |
| Předmět: |
0303 health sciences
Nanocomposite Amorphous metal Materials science Mechanical Engineering Composite number 02 engineering and technology Thermal treatment 021001 nanoscience & nanotechnology Nanocrystals 03 medical and health sciences Metallic glass Nanocrystal Mechanics of Materials TA401-492 General Materials Science Deformation (engineering) Composite material In situ deformation 0210 nano-technology Ductility Materials of engineering and construction. Mechanics of materials Shear band Transmission electron microscopy 030304 developmental biology |
| Zdroj: | Materials & Design, Vol 209, Iss, Pp 109970-(2021) |
| ISSN: | 0264-1275 |
| Popis: | Bulk metallic glasses (BMGs) have attracted wide interest, but their successful application is hindered by their low ductility at room temperature. Therefore, the use of composites of a BMG matrix with crystalline secondary phases has been proposed to overcome this drawback. In the present work we demonstrate the fabrication of a tailored BMG nanocomposite containing a high density of monodisperse nanocrystals with a size of around 20 nm using a combination of mechanical and thermal treatment of Cu36Zr48Al8Ag8 well below the crystallization temperature. Direct observations of the interaction of the nanocrystals with a shear band during in situ deformation in a transmission electron microscope demonstrate that the achieved nanocomposite has the potential to inhibit catastrophic fracture in tension. This demonstrates that a sufficient number of nanoscale structural heterogeneities can be a route towards BMG composites with superior mechanical properties. |
| Databáze: | OpenAIRE |
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