Consolidation of a nanostructured Al2O3 reinforced Fe-Cr composite by rapid sintering and its mechanical properties

摘要

Nano-powders of Fe_(0.67)Cr_(0.33) and Al2O3 were synthesized from CrO3 and 2FeAl powders by high energy ball mining. A highly dense nanocrystalline 3Fe_(0.67)Cr_(0.33)-Al2O3 composite was consolidated by a pulsed current activated sintering (PCAS) method within 2 minutes from mechanically synthesized powders of Al2O3 and Fe_(0.67)Cr_(0.33). The average hardness and fracture toughness values obtained were 840 kg/mm~2 and 10 MPa·m~(1/2), respectively.