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Microstructure characterization of rapidly solidified Al-Fe-Cr-Ce alloy by positron annihilation spectroscopy |
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| Authors: | Alena Michalcová Dalibor VojtěchJakub ?í?ek Ivan ProcházkaJan Drahokoupil Pavel Novák |
| Affiliation: | a Institute of Chemical Technology, Prague, Department of Chemical Technology of Monuments Conservation, Technicka 5, 166 28 Prague, Czech Republic b Institute of Chemical Technology, Prague, Department of Metals and Corrosion Engineering, Technicka 5, 166 28 Prague, Czech Republic c Department of Low-Temperature Physics, Faculty of Mathematics and Physics, Charles University, V Holešovi?kách 2, CZ-180 00 Prague 8, Czech Republic d Institute of Physics - Academy of Sciences CR, Na Slovance 2, 182 21 Prague 8, Czech Republic |
| Abstract: | Positron annihilation spectroscopy was employed for the microstructure characterization of rapidly solidified Al-3 wt.% Cr-3 wt.% Fe-0.8 wt.% Ce alloy prepared by melt spinning. Results of the positron annihilation study are analyzed within the diffusion trapping model and compared with results of X-ray diffraction, transmission electron microscopy and microhardness measurements. A good consistency among all experimental techniques was obtained. The rapidly solidified alloy exhibits ultra fine grained structure, consisting of cells separated by dislocation walls. Annealed samples showed no significant changes in structure up to 400 °C which proves good thermal stability of ultra fine grained structure. Exposure of the sample to temperature of 500 °C caused significant changes in the material. |
| Keywords: | Metals and alloys Nanostructured materials Rapid solidification Positron spectroscopies Transmission electron microscopy X-ray diffraction |
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