Abstract
A ternary addition in the binary solution of an impurity in a metal can reduce the solubility and enhance the grain-boundary segregation of the impurity. Showing that both phenomena have a common thermodynamic basis makes it possible to predict segregation behaviour in ternary systems with the help of solubility data. This correlation is illustrated in the case of the temper-embrittlement problem, and it is shown moreover that metallic elements which interact strongly enough with the impurity to increase its segregation can also decrease its solubility to a level where the segregation is appreciably lowered.
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