Abstract
Extruded rods of FeAl have been produced from ingots, rapidly solidified powders and rapidly solidified ribbons of various Fe:AI ratios. The rods made by extrusion of powders or ribbons contain numerous oxide particles aligned along the extrusion direction which arose because of prior handling in air. In contrast, rods made from ingots are relatively free of oxides. It has been found that the as-extruded grain size increased with increasing extrusion temperature and decreasing reduction ratio. However, for the same extrusion conditions, the grain size after hot extrusion of castings is significantly higher than when powder is used as starting material. Dislocation structures characterized by transmission electron microscopy have revealed that at high extrusion temperatures dislocation predominate whilst at low extrusion temperature dislocations are also observed. The density of dislocations increases with increasing aluminum content.
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