Abstract
FeAl matrix composites, containing Al_2O_3 or Fe_3AlC, have been prepared by mechanical alloying (MA) and consolidation using vacuum hot pressing (VHP). The dispersoids, and also matrix, have been formed during MA and consolidation process from elemental starting material, Fe, Al, C/mill scale powder. Powder mixture were milled to form matrix having the composition of Fe-40mol%Al and 10vol% fraction of precipitation. The present study examined the effects of precipitation on the structure and mechanical properties from ambient to 1273K. Micro-hardness of the FeAl, FeAl+Fe_3AlC and FeAl+Al_2O_3 composition showed HV440, HV524 and HV813, respectively. FeAl+Fe_3AlC composition compact showed 0.2% proof stress of about 1380MPa from ambient to 573K. This value is much higher than the large grained Fe-40mol%Al, about 300MPa.
