Abstract
Powder mixture of pure Fe, water atomized Fe powder (0.63mass%O), pure Al, and mill scale Fe power (24.5mass%O) was milled for certain period. Powders were mixed to be the composition of Fe-40mol%Al and Fe-40mol%Al + 2.5 vol% Al_2O_3 after mechanochemical reaction. When the water atomized Fe powder was used for milling, about 2.6vol% Al_2O_3 will form after the PM process. Almost full density compacts are obtained by vacuum hot pressing under the condition of 1273K-150MPa-3.6ks. The compacts exhibits fine microstructure less than 100nm B2 (FeAl) and fine precipitation from EDS, TEM and electron diffraction. The carbide, Fe_3AlC_0.5 is formed during PM process and it located within and between the MA powder due to the addition of stearic acid as process control agent.
