Abstract:The fracture behaviors of DO₃-ordered Fe-28Al alloys with or without V addition were studied. The results show that addition of element V into Fe-Al alloy can improve the mechanical properties of the alloy. Contrasted with transgranular fracture of Fe₃Al alloy at room temperature, the Fe₃Al containing V has intergranular and transgranular cleavage mixed fracture mode. The theoretical calculation conforms that V addition could increase cleavage strength of Fe₃Al alloy from 98.4057kJ/mol to 173.1445kJ/mol in 〈111〉 direction and from 29.6604kJ/mol to 47.6730kJ/mol in 〈100〉 direction.

Key words: fracture; cleavage strength; DO₃-ordered Fe-Al alloy; vanadium