Abstract
Investigation on the structural evolution for the Ti–Si–C system during mechanical alloying (MA) using a planetary ball mill was systematically performed under identical milling conditions. Experimental results on different powder mixtures were examined and compared. Two kinds of mechanically induced chemical reactions were observed in the Ti–Si–C system, which depends on the composition of the ball-milled mixtures. Gradual reaction was observed in both the Ti 50C 50 and Si 50C 50 mixtures, and TiC and SiC as the resultants were obtained, respectively. The reaction of Ti 50Si 50 mixture during MA was also a gradual reaction, but the resultants are crystalline Ti 5Si 3 and an amorphous phase. The TiC–SiC composites, however, were synthesized by mechanically alloying the Ti 25Si 25C 50 powder mixture through a mechanically induced self-sustaining reaction (MSR) under the same milling conditions as those of Ti 50C 50, Si 50C 50 and Ti 50Si 50 mixtures. So the MSR process might be applied to synthesize TiC–SiC composites. The structural evolution processes and thermodynamics of the reactions are discussed.
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