Abstract
Dispersion strengthened aluminum has been produced by mechanical alloying (high energy ball milling) and subsequent extrusion. The production process was modified in several ways in order to determine the changes of the dispersoid structure during annealing. As such, extrusion was performed cold and milling was conducted in part without lubrication. The high strength of the mechanically alloyed aluminum is due to a dispersion of both γ-Al2O3 and Al4C3-particles with sizes of the order of 10 nm. The dispersoids are amorphous after milling and crystallize during heating in the temperature range of 400 to 500 °C (673 to 773 K). The crystallization coincides with an increase of the room temperature hardness of the material. Possible techniques for improving dispersion strengthened materials have been considered and are discussed.
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