Abstract
Centimeter-scale Al85Ni5Y6Co2Fe2 bulk metallic glass composites were fabricated by warm extrusion of gas-atomized amorphous powders. Thermal behavior and microstructure of both the starting powders and the extruded samples formed with different extrusion ratios were studied in detail. The viscosity dependence of the powders on temperature was analyzed by calculation. The result demonstrated that the viscosity decreases steeply near the glass transition temperature and the minimum viscosity value calculated is about 1.37×108Pas at 550K. Those have been confirmed by the viscous flow in warm extrusion around such a temperature. The compacts consolidated at 550K under various extrusion ratios from 6.8 to 15.7 yielded nanostructured α-Al/glassy matrix composites with high hardness. The appearance of such a devitrified structure is thought to be related to the deformation-induced temperature rise during extrusion.
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