The grain structure and texture of cast iron aluminides have been investigated in the scanning electron microscope by orientation contrast imaging and electron back-scatter diffraction, respectively. Depending on the aluminum concentration the alloys exhibit a fine-grained chill zone, medium grain size columnar zone and/or coarse-grained equiaxed zone. The texture is random except in the columnar zone which is characterized by a <100> fibre texture in the direction of heat flow, i.e parallel to the elongated grains. The development of grain structure and texture is discussed with respect to cooling rate, thermal and constitutional undercooling, and order.

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