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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Structure and density of Fe36Co36B19.2Si4.8Nb4 bulk glassy alloy

Januszka A., Nowosielski R.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 52, nr 2

67--74

Purpose: The work presents density measurements of bulk metallic glasses in as-cast state. Additionally casting method and structure characterization was displayed. Design/methodology/approach: The studies were performed on Fe36Co36B19.2Si4.8Nb4 metallic glasses in form of rods with diameter 2 and 3 mm. Samples were fabricated using copper mould casting method. The master alloy characteristic temperatures (Tm - melting point and T1 - liquidus temperature) were determinate by differential thermal analysis (DTA). The structure was characterized by X-ray (XRD) method and scanning electron microscope (SEM). The densities of metallic glassy rods have been measured by using the Archimedes principle. Findings: The XRD and SEM investigations revealed that the studied samples in form of rods were amorphous. Broad diffraction “halo” was observed for every testing piece. Fracture observation confirmed glassy state of samples. Archimedes principle allows calculating density of tested sample. Practical implications: The FeCo-based bulk metallic glasses have attracted great interest for a variety application fields for example electric applications, precision machinery materials or structural materials. Metallic glasses exhibit higher density than their crystalline counterparts and could be apply as a satisfactory structural material. Originality/value: The obtained results confirm the utility of applied investigation methods in the thermal and structure analysis of examined amorphous alloys. Density of metallic glasses is important properties which influence on specific application these materials. This materials offer attractive qualities, combining some of the desirable properties of conventional crystalline metals and the formability of conventional oxide glasses.