Grain-boundary enrichment factor

Seah [17] has shown that there is a correlation between the tendency for a solute to segregate to a grain boundary and its solubility in the alloy matrix. The lower the solubility the greater the tendency for segregation. This can be expressed by an enrichment factor jS,... 

The solubilities of boron in NijSi and Ni3Ge were shown to be very much lower than that in NijAl (Briant and Taub, 1988). Correspondingly, the enrichment factor of boron at grain boundaries of these compounds was very large, i.e. more than 50 (Briant and Taub, 1988). Thus, the general form of behavior observed in conventional alloys, i.e. that the grainboundary enrichment factor is proportional to the inverse of the solid solubility of the species in the... 

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