Synthesis, microstructure, and hardness of rapidly solidified Cu-Cr alloys
| Autor: | L. Christiansen, Benjamin Breitbach, Christian Liebscher, Alba Garzón-Manjón, Gerhard Dehm, Ines Kirchlechner, Hauke Springer |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanostructure Scanning electron microscope Mechanical Engineering Metals and Alloys 02 engineering and technology Splat quenching 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Mechanics of Materials Transmission electron microscopy Materials Chemistry Particle Composite material Thin film Severe plastic deformation 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 794:203-209 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.04.209 |
| Popis: | Cu-Cr alloys with ∼32 at.% Cr were rapidly solidified by splat quenching or laser melting techniques with the intention to form a very fine grained, non-equilibrium nanostructure similar to those obtained by severe plastic deformation or thin film deposition. The rapidly solidified Cu-Cr alloys were analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Both synthesis techniques lead to a similar two-phase microstructure with a nearly pure fcc Cu matrix with μm grain sizes and bcc Cr particles highly supersaturated with Cu. Splat quenching provides finer bcc particles with dimensions of less than 50 nm compared to laser melting with particle sizes of 100–2000 nm. In case of laser melting, (14 ± 2) at.% Cu are contained in the bcc phase, while splat quenching freezes (20 ± 2) at.% Cu in the bcc particles. The microstructures are discussed and compared to the non-equilibrium microstructures reported in literature using severe plastic deformation and thin films deposition. |
| Databáze: | OpenAIRE |
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