Abstract
Mechanical alloying of a powder mixture of elemental Al and graphite has been performed in a high-energy ball mill. The structural evolution has been characterized by X-ray diffraction and transmission electron microscopy. The carbide Al 4C 3 is first formed as an intermediate product. Further milling leads to destabilization of Al 4C 3. It is proposed that destabilization of Al 4C 3 is induced by the accumulated defects and the high pressure due to collision of the balls. Balling milling of the elemental AlC powder mixture finally results in a f.c.c. solid solution with a carbon content up to 23 at%. Whereas an amorphous phase is formed in the composition range of 28–50 at% C.
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