Plastic flow and microstructural instabilities during high-pressure torsion of Cu/ZnO composites
| Autor: | Anna Kosinova, Boris B. Straumal, Eugen Rabkin, Askar Kilmametov, Yuanshen Qi |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Torsion (mechanics) Nanoparticle chemistry.chemical_element Laminar flow 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Copper chemistry Mechanics of Materials visual_art 0103 physical sciences visual_art.visual_art_medium General Materials Science Ceramic Composite material Severe plastic deformation 0210 nano-technology Hybrid material |
| Zdroj: | Materials Characterization. 145:389-401 |
| ISSN: | 1044-5803 |
| Popis: | We conducted high-pressure torsion (HPT) of hybrid materials composed of two copper disks with a layer of ZnO ceramic nanoparticles sandwiched in-between. A detailed microstructural analysis of the processed samples revealed a surprisingly high level of plastic deformation introduced in individual ZnO particles, even though they possess a much high hardness than the surrounding Cu. Moreover, we demonstrated that by tailoring the initial geometry of the system (i.e. introducing holes in the cladding Cu disks), we can effectively change the flow mode of ZnO particle clusters from laminar to turbulent one and facilitate their deagglomeration process. Finally, the presence of ZnO particles decreased the microstructural stability of the Cu matrix. We discussed the obtained results in terms of hydrodynamic and microstructural instabilities during plastic deformation. This work expands our understandings of the cooperative severe plastic deformation of two dissimilar materials and sheds new light on the design of hybrid materials. |
| Databáze: | OpenAIRE |
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