Bulk amorphous Al75V12.5Fe12.5−xCux alloys fabricated by consolidation of mechanically alloyed amorphous powders

Abstract

• Al 75 V 12.5 Fe 12.5 − x Cu x ( x = 0, 6.25, and 12.5 at%) amorphous powders were synthesized by MA. • Bulk Al 75 V 12.5 Fe 12.5 amorphous alloy is obtained by means of hydraulic pressing. • The Vickers microhardness of bulk sample is in the range of 821-927 HV. Hydraulic press was used to produce bulk amorphous Al 75 V 12.5 Fe 12.5 − x Cu x ( x = 0, 6.25, and 12.5) (at.%) alloy by consolidation of mechanically alloyed amorphous powder. The as-milled powders and bulk alloy were examined by X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The glass-forming ability was evaluated in accordance with the milling time. The results show that the glass-forming ability of the mechanical-alloyed Al 75 V 12.5 Fe 12.5 − x Cu x powders decreases with the increase of x . The onset crystallization temperatures ( T x onset ) of the three powders are 749 K, 771 K and 712 K, respectively. The results also indicate that the quality of consolidation is very good and the product’s Vickers microhardness is relatively high (821–927 HV).