Effect Of High Magnetic Field On Solidification Structure Of Al-2.89%Fe Alloy

The effects of cooling rate, magnetic intensity and high gradient magnetic field on the distribution and morphology, of Al3Fe phase in Al-2.89%Fe (mass fraction) alloy were studied. The results show that the primary Al3Fe phase with needle-like morphology is gathered at the bottom of the sample due to the gravity force when the alloy is solidified without magnetic field. However, when a high magnetic field of 12 T is applied, the primary Al3Fe phase distributes throughout the sample homogeneously because that the magnetic force acted on the primary Al3Fe phase balances with the gravity force, and the primary Al3Fe phase aligns perpendicularly to the magnetic field direction with a preferred direction [121]. Its orientation extent is riot affected by cooling rate, but strengthened with increasing magnetic intensity. When the sample is set at the position with a large positive gradient magnetic field, the magnetic force acted on the primary Al3Fe phase is greater than the gravity force, resulting in their segregation into the tipper portion of the sample. Several needle-like primary Al3Fe phases are integrated to form the polymer with a star shape. Furthermore, the mechanism of high magnetic field was discussed.