Abstract:The mechanical properties of Fe-36.5% Al (mole fraction) intermetallic alloy at elevated temperatures were measured. The results indicate that the specific elongation of the alloy increases significantly with the temperature increasing from 600℃to 1000℃and the maximum of specific elongation is up to 115% when the alloy is deformed at 1000℃. The dislocation features in the alloy were also investigated by transmission electron microscopy (TEM). There exist not only a large number of gliding dislocation lines but also a number of helical dislocations in FeAl alloy after deformed at elevated temperatures. All of these dislocations have a Burgers vector of〈111〉. The climb motion as well as the glide motion of dislocations with〈111〉Burgers vector is responsible for a good ductility of FeAl alloy deformed at elevated temperatures.

Key words: FeAl　intermetallic alloy　mechanical property　dislocation