Mössbauer spectroscopy showed that mechanical activation by compression
shear in Bridgman anvils led to deformation-induced dissolution of
Al6Fe
and Al13Fe4
aluminides and iron in the aluminum matrix, which was followed by formation of an Al–Fe solid solution,
Al9Fe2
and Al5Fe2
aluminides, and their defective modifications. The
Al6Fe
and Al13Fe4
aluminides dissolved with an extraction-type stoichiometry, which was explained by an
easier release of aluminum (as compared to iron) to the aluminum matrix and the
accompanying precipitation of aluminides owing to saturation of the structure with
deformation vacancies. A unified set of metastable phases, which appeared during quick
quenching and intensive plastic deformation of the Al–Fe system, pointed to a common
diffusion mechanism of the phase transformations.
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