Abstract:The rapidly solidified powder of Al-Fe-Cr-Zr-V-Si alloy was prepared using multi-stage atomization rapid solidification device and then consolidated by hot extrusion after cold isostatic pressing and vacuum degassing. The microstructures, room-and elevated-temperature mechanical properties of the consolidated material and their thermal stability were studied by optical microscopy, transmission electron microscopy, hardness test and tensile test. The results show that this alloy has excellent mechanical properties at room and high temperatures and good thermal stability, and it exhibits good heat-resistance at least below 400℃. The main second phases that strengthen this alloy are Al₁₂(Fe,Cr,V)₃Si and Al3Zr, of which the Al₁₂(Fe,Cr,V)₃Si silicide is of bcc structure (a=12.6 ) and has excellent thermal stability and coarsening resistance.

Key words: rapid solidification　powder metallurgy　heat-resistant aluminium alloy　Al-Fe-Cr-Zr-V-Si