Interface-mediated softening and deformation mechanics in amorphous/ amorphous nanolaminates
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866914127740403712 |
|---|---|
| author | Devulapalli, Vivek Klimashin, Fedor F. Bärtschi, Manuel Waldner, Stephan Thöny, Silvia Schwyn Michler, Johann Maeder, Xavier |
| author_facet | Devulapalli, Vivek Klimashin, Fedor F. Bärtschi, Manuel Waldner, Stephan Thöny, Silvia Schwyn Michler, Johann Maeder, Xavier |
| contents | Interfaces govern the unique mechanical response of amorphous multilayers. Here, we examine nanoindentation hardness and deformation behaviour of amorphous-amorphous Ta$_2$O$_5$/SiO$_2$ nanolaminates with bilayer thicknesses ranging from 2 nm to 334 nm. Whilst monolithic SiO$_2$ exhibits catastrophic failure through a single dominant shear band, multilayer architectures demonstrate varied deformation mechanisms. Hardness decreases with reduced bilayer thickness, from 7.7 GPa at 334 nm to 5.5 GPa at 2 nm spacing, contrasting with crystalline systems, which strengthen with decreasing spacing. Cross-sectional transmission electron microscopy reveals that fine bilayer spacings promote closely spaced vertical shear bands with bilayer compression, while coarser spacings show fewer, widely spaced shear bands with chemical intermixing. Scanning electron diffraction mapping demonstrates significant densification beneath indents. The high interface density facilitates strain accommodation that prevents catastrophic failure typical of brittle amorphous materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_00213 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interface-mediated softening and deformation mechanics in amorphous/ amorphous nanolaminates Devulapalli, Vivek Klimashin, Fedor F. Bärtschi, Manuel Waldner, Stephan Thöny, Silvia Schwyn Michler, Johann Maeder, Xavier Materials Science Interfaces govern the unique mechanical response of amorphous multilayers. Here, we examine nanoindentation hardness and deformation behaviour of amorphous-amorphous Ta$_2$O$_5$/SiO$_2$ nanolaminates with bilayer thicknesses ranging from 2 nm to 334 nm. Whilst monolithic SiO$_2$ exhibits catastrophic failure through a single dominant shear band, multilayer architectures demonstrate varied deformation mechanisms. Hardness decreases with reduced bilayer thickness, from 7.7 GPa at 334 nm to 5.5 GPa at 2 nm spacing, contrasting with crystalline systems, which strengthen with decreasing spacing. Cross-sectional transmission electron microscopy reveals that fine bilayer spacings promote closely spaced vertical shear bands with bilayer compression, while coarser spacings show fewer, widely spaced shear bands with chemical intermixing. Scanning electron diffraction mapping demonstrates significant densification beneath indents. The high interface density facilitates strain accommodation that prevents catastrophic failure typical of brittle amorphous materials. |
| title | Interface-mediated softening and deformation mechanics in amorphous/ amorphous nanolaminates |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.00213 |