The influence of DC magnetic field intensity（0

1

.4T）on grain orientation and mechanical properties of Al-4.5Cu alloy were investigated.The results show that change of solidification microstructure of the alloy can be ignored.Volume fraction of the second phase in the alloy is decreased gradually

and the content of Cu element in grain of the alloy is increased gradually with the increase of magnetic field intensity.When the strength of DC magnetic field is less than 0.84 T

the diffraction intensity of crystal plane（111）ofα-Al matrix is weakened

and the diffraction intensity of crystal plane（200）is enhanced significantly.The influence of DC magnetic field on crystal orientation of the alloy can be ignored when the magnetic field intensity is at 0.84

1

.4T

compared with the alloy without treatment.Tensile strength of the alloy is increased

while its elongation is decreased with DC magnetic field treatment.When the magnetic field intensity is 0.56 T

tensile strength of the alloy reaches 104.5 MPa

which is increased by up to 4.5%

compared with the sample without magnetic field treatment

and the elongation reaches a minimum value of 3.4%.