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Mechanisms of the Intergranular Segregation of Boron in (B2) FeAl Alloys

Small boron additions reduce the intergranular brittleness of some intermetallics, thanks to their intergranular segregation. Two different origins of this segregation were identified in FeAl (B2) alloys, containing 40 or 46 at. % Al. Its very fast kinetics, low level and almost no temperature dependence suggest a non-equilibrium mechanism, based on an interaction between boron atoms and the flux of migrating thermal vacancies. Still, an equilibrium segregation is also stable: its low level (few at. % B) may be explained be strong repulsive interactions between segregated boron atoms. Thanks to the cooperation of the two mechanisms of the segregation of boron, its reinforcing effect is efficient quite independently of the applied heat treatment.