X-ray diffraction studies of the liquid and melt-spun Al–Co–Si alloys

Abstract The short-range order in the liquid Al 86 − x Co 14 Si x (x = 4, 10, 12 at.%) alloys at 50, 150 and 250 °C above liquidus temperature has been studied by X-ray diffraction and reverse Monte Carlo simulations. The analysis of local atomic structure in RMC-models has been carried out by means of the Voronoi–Delaunay method. The existence of a prepeak on the total structure factor curves of the liquid alloys that identified medium range order caused by the specific arrangement of Co atoms has been observed. It was discovered that metastable CoSi intermetallic and nanocrystalline Al and Si phases have been formed in melt-spun Al 74 Co 14 Si 12 alloy. The annealing of the melt-spun Al 74 Co 14 Si 12 ribbons causes the attainment of Al 9 Co 2 and Si crystal phases.