Al2O3f/Mg-9Al-0.5Nd composites were prepared by pressureless infiltration method

and microstructure

compressive behavior and fracture morphology of the prepared composites were investigated by SEM（scanning electron microscope）

XRD（X-ray diffraction）and computer servo-material experimental machine.The results show that presence of new Mg2Si phase and a little particle and rod-like RE phase can be observed in the composites.The Mg2Si phase with the slight increase of size is increased in the heat treated composites.The compressive strengthes of the composites after T4 and T6 heat treatment are declined from 346.5 MPa in as-cast ones to 250.5 MPa and 327.5 MPa

respectively.After T6 heat treatment

compressive fracture of the composites is characterized by a mixed fracture instead of quasi-cleavage fracture

meanwhile

a small amount of fiber pulled out from the matrix can be observed.