In order to improve the brittleness of Fe-24 Al alloy

the alloying of C and Mn elements duplex was adopted

and the microstructure

phase structure and formation mechanism of the alloying Fe-24 Al alloy were investigated by the metallographic

SEM

XRD and confocal laser scanning microscopy.The results show that the phase structure is composed ofα-Fe、FeAl、Fe

3

Al and Fe

3

AlC phase

in which Alenrichment and C-enrichment phase can be observed.The hardness and strength of the alloys are increased from 280 HV

400 MPa to 330 HV

741 MPa

respectively

and the fracture modes are changed from brittle fracture to a fewer ductility fracture.The confocal laser scanning microscopy indicates that two kinds of white-enriched phases become cleaner

and the number of fine-enriched phases is increased.With the further increase of the temperature

the number of the white bulk and strip rich phases is decreased

and the ordered phases is dissolved into the matrix.When the temperature is the higher than1 100 ℃

the local oxidation phenomenon is presented in microstructure of the alloy.