Microstructure of Si50-55Al25-20Fe10Ni5Cr 5Zr5 alloys obtained by rapid solidification changes from homogeneously amorphous to heterogeneous - amorphous+c-Ge (c-Ge: crystalline Ge solid solution) by the addition of Ge. The size, volume fraction and composition of c-Ge particles depend on Ge concentration in the alloy. Fine particles, with a size less than 10 nm, were obtained at 7-10 at.% Ge. Small size and homogeneous distribution of c-Ge particles argue for homogeneous nucleation from the melt during rapid solidification. The Si55- 45Al20Fe10Ni5Cr5Zr 5Ge0-10 alloys are characterized by high values of hardness (935-1085 Hv) and electrical resistivity (11.0-12.6 μΩm). The exclusion of Ge from the amorphous phase resulted from the complicated interaction between constituent elements when weak bonding nature among Ge, Al and TM (TM-transition metals) atoms is obscured by strong attractive interaction among Si, Al and TM atoms.
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