Abstract
The bulk metallic glasses composites are a new class of bulk metallic glasses (BMGs), containing an amorphous metal matrix and reinforcing materials of metallic or ceramic nature in order to obtaining the desired combination of mechanical properties including strength, hardness, ductility and toughness. Composite materials of cylindrical form with the diameter of 10 mm and 5 mm in height were successfully prepared by hot-pressing of Zr - based glassy alloy powder and Fe - based nanocrystalline alloy powder in different volume fraction. The samples obtained were structural investigated by scanning electron microscopy and X-Ray diffraction and mechanically characterized by hardness and compression tests. It was found that increasing the volume ratio of the Fe-based nanocrystalline alloy up to a certain value leads to an increase in hardness and mechanical compressive strength.
Highlights
The bulk metallic glasses composites are a new class of bulk metallic glasses (BMGs), containing an amorphous metal matrix and reinforcing materials of metallic or ceramic nature in order to obtaining the desired combination of mechanical properties including strength, hardness, ductility and toughness
Fe – based glassy alloy powder obtained by the gas atomization method were subjected to differential scanning calorimetry (DSC) analysis, to determine the crystallization temperature, Tx, in order to establish the optimum temperature for the heat treatment applied to obtain the nanocrystalline structure
DSC curve of amorphous metal powders shown in Figure 1, indicates a crystallization process of the amorphous phase, with a strong exothermic effect, that starts at a temperature of 550oC
Summary
The bulk metallic glasses composites are a new class of bulk metallic glasses (BMGs), containing an amorphous metal matrix and reinforcing materials of metallic or ceramic nature in order to obtaining the desired combination of mechanical properties including strength, hardness, ductility and toughness. In this paper, has been studied the possibility of obtaining bulk metallic glasses composites by hot-pressing of Zr – based glassy alloy powder and Fe – based nanocrystalline alloy powder in different volume fraction.
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