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Abstract: Rapidly solidified aluminum alloys are promising materials with very fine microstructure. The microscopy observation of these materials is complicated due to overlay of fcc-Al matrix and different intermetallic phases. A possible way to solve this problem is to dissolve the Al matrix. By this process powder formed by single intermetallic phase particles is obtained. In this paper a new aqueous based dissolving agent for Al-based alloy is presented. The influence of oxidation agent (FeCl3) concentration on quality of extraction process was studied. [Copyright &y& Elsevier]

Abstract: Positron annihilation spectroscopy was employed for the microstructure characterization of rapidly solidified Al–3wt.% Cr–3wt.% Fe–0.8wt.% 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. [ABSTRACT FROM AUTHOR]