Electron microscopy nanoscale characterization of ball-milled Cu–Ag powders. Part I: Solid solution synthesized by cryo-milling
| Autor: | S. Zghal, Fang Wu, Pascal Bellon, Martin Hÿtch, Ray D. Twesten, J. P. Chevalier |
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| Rok vydání: | 2002 |
| Předmět: |
Nanostructure
Materials science Polymers and Plastics Condensed matter physics Metals and Alloys Microstructure Electronic Optical and Magnetic Materials Crystallography Electron diffraction Transmission electron microscopy Scanning transmission electron microscopy Ceramics and Composites Grain boundary Selected area diffraction Solid solution |
| Zdroj: | Acta Materialia. 50:4695-4709 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/s1359-6454(02)00285-9 |
| Popis: | We present a study of nanostructured Cu–Ag material obtained by low temperature ball milling. The microstructural characterization is carried out using a wide variety of transmission electron microscopy (TEM) techniques from conventional dark-field imaging, selected area diffraction and energy dispersive X-ray spectrometry (EDS) to more modern techniques of scanning TEM high-angle dark-field imaging (HAADF), nanodiffraction and high resolution imaging (HREM). A novel method of HREM image analysis is also presented which consists of calculating geometric phase images by Fourier filtering. Real-space maps of lattice spacings and lattice rotations are thus obtained. The analysis addresses the following essential points of nanostructural characterization: dislocation densities, grain sizes and morphologies, grain boundaries and local lattice rotations, local textures, local variations in lattice parameters. A new description of the microstructure emerges from the observations, quite different to that expected. Analytical modeling suggests that large lattice rotations can be expected in nanomaterials produced by intense deformation. |
| Databáze: | OpenAIRE |
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