Monotectic Al-6.5wt%Bi alloy was directionally solidified in the presence of a transverse static homogeneous magnetic field up to 2.0 kG to determine if gravity-induced convection effects could be reduced or eliminated. Growth rate V was varied over the range 1 to 100 mum/s, while temperature gradient at the liquid-solid interface was 120 K/cm. The microstructures of Al-6.5wt%Bi alloy is characterized by regular, aligned Bi fibres or Bi droplets under given growth conditions. Morphological, thermal and magnetic analyses were carried out on sample grown with and without an applied magnetic field. Results indicated that spacing and diameter of Bi fibres decreased in a transverse magnetic field, and the microstructure became more homogeneous, which means that transverse static homogeneous magnetic field can effectively reduce or eliminate gravity-driven and thermal convection during directional solidification of Al-Bi monotectic alloy.