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Investigation of medium range order and glass forming ability of metallic glass Co69FexSi21−xB10 (x  =  3, 5, and 7)

Metallic glass of composition Co69FexSi21−xB10 (x  =  3, 5, and 7) was studied using spatially resolved x-ray diffraction and positron annihilation spectroscopy. It was observed that the solute centered clusters forming the metallic glasses were connected to a fractal network of a reduced dimension of 2.18. The medium range order in the present system is described with a correlation function and its validity is discussed. A theoretical estimation of its glass forming ability (GFA) complimented the observations made on the local structural changes due to variation in Si content. The distribution of open volume defects in the metallic glasses during processing was found to be related to the relative GFA of the alloy compositions.