The possibility of using a ball mill to obtain an amorphous state in bulk amorphous Fe61.4Ni3.6Cr3.2Si2.4Nb7.8Mn3.6B18 alloy is studied. The presence of a metastable phase in the initial reagents allows the rate of amorphization to be notably accelerated with an almost full transformation to the amorphous state. Compared to a quench-hardened tape, however, the content of the amorphous state obtained via mechanical milling is distinguished by a reduced content of boron and therefore a lower temperature of crystallization.