X-ray and neutron small angle scattering from amorphous chromium–carbon–hydrogen-alloys
| Autor: | Siegfried Steeb, M. Drakopoulos, Peter Lamparter |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Diffraction
Materials science Hydrogen Scattering Annealing (metallurgy) Analytical chemistry chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials Amorphous solid Crystallography Chromium chemistry Materials Chemistry Ceramics and Composites Neutron Small-angle scattering |
| Zdroj: | Journal of Non-Crystalline Solids. 221:228-237 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/s0022-3093(97)00427-4 |
| Popis: | Amorphous Cr80C10H10 and Cr80C10D10 films were produced by electrodeposition and investigated by X-ray and neutron small angle diffraction. The surface scattering was separated by the variation of the thickness (X-rays) and by the immersion technique (neutrons). The amorphous specimen consists of a Cr-matrix which contains segregates in which the H atoms are replaced by C atoms or vice versa. The diameter of the segregates is 12 nm and the specimen consists of about 25 vol.% segregates. A phase separation in two amorphous phases, one consisting of a C-enriched chromium-carbide, the other of pure Chromium, occurs after annealing the alloys at 200°C for a few minutes. Longer annealing time causes a continuous crystallization of the amorphous Cr-phase. The correlation length for the amorphous Cr-phase is approximately 7 nm. The event of phase separation may explain the increase in hardness and corrosion resistance of the alloys observed in previous research. |
| Databáze: | OpenAIRE |
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