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Abstract
A study of the grain boundary segregation of nickel and antimony in iron is reported in the present paper. It is shown by the results that antimony segregation increases as the bulk nickel and antimony concentrations increase. However, once the solubility limit for antimony in iron is exceeded, the amount of segregation remains essentially constant. Segregation of nickel in iron increases as the bulk concentration of nickel increases and as the bulk concentration of antimony increases. The last effect is observed only when a certain level of antimony is reached, a level that depends on the concentration of nickel. Small additions of antimony, even though they cause an increase in segregation of antimony, do not cause an increase in segregation of nickel and, once the solubility limit for nickel in Fe–Sb alloys is exceeded, the segregation of nickel reaches a plateau. It is only between these two regimes that segregation of nickel is affected by changes in the concentration of antimony. All these results can be explained based on the mutual effects that nickel and antimony have on the solubility of each in iron. The results are not consistent with models based on cosegregation. Finally, other data in the literature are examined; all these data can be explained by an argument based on solubility changes.
MST/795