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Effect of a direct magnetic field on the interfacial microstructure between molten alinium and solid iron was studied. The intermetallic phases formed in the intermetallic layers were investigated by means of electron probe microanalysis (EPMA) and X-ray diffraction (XRD). It was found that the DC magnetic field can reduce the average thickness of the intermetallic layer and the average aluminium content in the intermetallic layer. Moreover, the intermetallic phases formed in the intermetallic layers are identified as Al3Fe and Al5Fe2 in the absence of the DC magnetic field, while only Al5Fe2 phase present in the presence of the DC magnetic field.