Influence of a weak static magnetic field on the primary dendrite arm spacing of a directionally solidified Ni-based superalloy

► The primary endrite arm spacing (PDAS) for directionally solidified superalloy DZ417G under the weak static magnetic field is significantly decreased. ► The PDAS was decreased by 23% and 21%for the ingots with 4 mm and 10 mm in diameter with enhancing the intensity of applied magnetic field from 0 to 0.05 T, respectively. ► the PDAS is slightly increased, When the intensity of magnetic field is larger than 0.05 T.