Abstract
To prepare a TiC-dispersed magnesium, the mixtures of elemental Mg, Ti and graphite powder were mechanically alloyed up to 288 ks in Ar. The obtained fine grain mixture of the Mg-Ti-C system was heat-treated up to 773 K for 3.6 ks in vacuum.CKα X-ray spectra of TiC, graphite, micro crystalline graphite and mechanically alloyed products were measured by an electron-probe microanalyzer (EPMA) with the second-order reflection of a Johann-type lead stearate multilayer pseudocrystal.The progress of the mechanical alloying (MA) reaction was monitored with the CKα X-ray spectral change which quantitatively reflects the amount of TiC in the reaction mixtures. The early stage of the MA reaction is solely a refinement of graphite; graphite did not react on Ti. The next stage is the formation of TiC from refined graphite and Ti. Heat-treatment accelerates the formation of TiC, but graphite is not completely converted into TiC with the MA reaction and heat-treatment because a small amount of refined graphite has been subsequently detected in the reaction mixtures even after a prolonged MA time and heat-treatment at 773 K.
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