The MnBi/Bi eutectic was directionally solidified with freezing rate oscillations caused by electric current pulses. The influence of current pulsing on microstructure depended on the ampoule translation rate V and pulsing conditions. Continuous electric current had a small effect on the microstructure. Current pulsing with the solid positive had a substantial influence, greater than with the solid negative. For V greater than or equal to 2 cm/h, current pulsing transformed sections of the ingot from a quasi-regular microstructure to irregular MnBi, broken lamellae or completely void of MnBi. The reverse was true at 1.1 cm/h. For the quasi-regular portions, the average MnBi rod spacing I decreased almost linearly with the average current. This result contradicts the hypothesis that freezing rate fluctuations were responsible for the effect of convection on MnBi-Bi microstructure. The decrease of. with current pulsing was less at high V, where the rods were more rounded. Current pulsing also increased the roundness of the MnBi rods. The percent MnBi in the grains with a quasi-regular structure decreased with increasing current pulsing amplitude.