Structural Evolution and Grain Growth Kinetics of the Mechanically Alloyed Fe50Al50 During Heat Treatment

Nanocrystalline FeAl powder is synthesized by subsequent heat treating the Fe50Al50 (at.%) alloy prepared by mechanical alloying. During annealing the milled FeAl powder, the grain growth of B2-FeAl occurs with the order transformation from Fe(Al) to B2-FeAl. The activation energy for the nanocrystalline FeAl growth is calculated to be 534.9 kJ/mol, according to the kinetics theory of nanocrystalline growth. The grain growth of FeAl is significantly inhibited especially at elevated temperature.