Abstract
Titanium and silicon powder mixtures (Ti−3.67−80)at.%Si) were vibratory ball milled to investigate the effect of milling conditions and initial powder compositions on the phase formation during milling. During milling, the temperature of a mill container was measured with a thermocouple attached to the surface of the container. An exothermic temperature spike was observed only when the powder with Ti−40at.%Si composition was milled for 60 h, aged for 48 h and milled again for 32.5 h. During this temperature spike, an amorphous phase which had been formed after the secondary milling time of 32.5 h rapidly changed into a crystalline phase and fine particles were formed. The temperature spike suggests the occurrence of the combustion synthesis reaction during milling. On the contrary, no temperature spike was observed in continuous milling condition.
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