Addressed is the effect of ball milling on aluminothermic reduction of TiO 2 . In 0.5-h milled 3TiO 2 + Al mixtures, a two-step reaction was found to yield TiAl and Ti 3 Al. Upon an increase in the milling time (to 20 h), a one-step reaction yielded TiAl. The activation energy for TiAl formation was 75 kJ mol −1 for 0.5-h milled samples and 33 kJ mol −1 for 20-h milled samples.
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Kamali et al. (2009) studied this question.
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