Observations by transmission electron microscopy on the decomposition of quenched and aged Fe-Sn, Fe-Sb, and Fe-Sb-Ni solid solutions show that precipitation of the equilibrium phase begins heterogeneously at grain boundaries and imperfections within the grains. The region of precipitation propagates by a discontinuous mechanism involving the formation of dislocations. The addition of 1 wt.-% Ni to an Fe-8 wt.-% Sb alloy was found to accelerate greatly the discontinuous precipitation.
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