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

rare earth elements La was added

and the different solid solution methods were performed to the alloy contained La.And the relationship between microstructures of as-cast

solid solution treatment state and mechanical properties of the alloy was investigated by metallographic

micro-hardness measurement

compression performance measurement and XRD.The results show that the grain size is significantly refined by adding rare earth element La

and the hardness and compressive strength are decreased with the ductility significant increase.After solid solution treatment

the grain size in microstructure of Fe-24 Al and Fe-24Al-La alloy is decreased slightly.The XRD results show that the Fe-24Al-La alloy mainly consists ofα-Fe

FeAl phase

Fe3 Al phase

and a new phase of Fe4Al8 La appears in the alloy after solid solution treatment at 825 ℃ and 850 ℃.The maximum compressive strength of the Fe-24Al-La alloy reaches 1 250 MPa.Compared with Fe-24 Al alloy

the ductility has significantly increased

and the best ductility is obtained with solid solution treatment at 825 ℃ and 850 ℃

where compression curve exhibits smooth with absence of crack point.