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The solidification behaviors of nonferromagnetic Al3Ni precipitated phase in Al-8%Ni alloy with a high magnetic field applied have been studied experimentally. It is found that the magnetic field induces the crystals of Al3Ni phase to orient with their c-axes parallel to the field and the long axes of the crystals are perpendicular to their c-axes. There are several Al3Ni congregation planes parallel with each other, which are perpendicular to the field, that is, regular Al3Ni laminated alignment structure is formed in the alloy. In the planes, there are several big Al3Ni congregations, in the inner part of which there are aligned Al3Ni crystals.