Abstract
The effects of milling intensity on the amorphisation of Al–Fe powder mixtures containing 10, 15, 20, and 25 at.-% Fe, during mechanical alloying by a high energy planetary ball mill, have been investigated. Two levels of milling intensity, 80g and 150g (where g is acceleration due to gravity), were adopted. Two different pathways of amorphisation reaction were found; Al–Fe solid solution → amorphous phase; and Al–Fe solid solution → formation of Al5Fe2 phase → amorphous phase. The former reaction was observed in Al–10, –15, –20, and –25 at.-%Fe compositions at the lower milling intensity and in Al–10 at.-%Fe at the higher milling intensity. The latter reaction was observed in Al–15, –20, and –25 at.-%Fe compositions at the higher milling intensity. The two pathways of amorphisation reaction are explained mainly by a kinetics approach.
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