A new type of hig-strength Al-based alloys with an amorphous or nanoscale compound plus Al phase have been developed in Al-R-LM and Al-EM-LM (R=rare earth metal, EM=IV-VI group metals, LM=VII and VIII group metals) systems by the use of rapid solidification and powder metallurgy (P/M) techniques. The high-strength bulk alloys were synthesized by the P/M process of the formation of amorphous alloy powder, followed by warm extrusion at temperatures well below crystallization temperature (T_x) for the Am alloys, near the T_x for the nanoscale compound+Al alloys. The highest strength reaches about 1200 MPa for the former bulk alloys and 1000 MPa for the latter bulk alloys. The high strength values are promising for future application of the nonequilibrium Al-based alloys.
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