An investigation on the microstructural stability of rapidly solidified AlFeVSi alloy ribbon

Abstract The thermal stability of the dispersive particles in melt-spun ribbons was studied by differential thermal analysis, X-ray diffraction, energy-dispersive X-ray analysis and transmission electron microscopy. The experimental results show that nearly spherical b.c.c. α-Al 13 (Fe, V) 3 Si dispersoids exist at room temperature. No noticeable growth of the dispersoids is observed up to 510 °C for 100 h. Polygonal h.c.p. θ-Al 2 (Fe, V, Si) dispersoids appear when the temperature rises to 650 °C. At 650 °C for 25 h band-shaped (Al, Si) 13 Fe 14 dispersoids are formed in the specimen and spherical, polygonal and band-shaped dispersoids are coexistent. The reason for the fineness and very slow growth rate of the dispersoids and the role of V atoms in the phase transformation are discussed.