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Analytical scanning transmission electron microscopy (AEM) was used to study grain‐boundary solute segregation in the systems MgO‐NiO, A1 2 O 3 ‐Y, O 3 , NiO‐Cr 2 O 3 , and NiO‐Al 2 O 3 . Electron beam spreading within the specimen was incorporated into a model to quantitatively measure solute segregation. Grain‐boundary segregation occurred in A1 2 O 3 ‐Y 2 O 3 and NiO‐Cr 2 O 3 but was not detected in MgO‐NiO and NiO‐Al 2 O 3 specimens. These results and the quantitative measurements agree with equilibrium solute segregation theories. Microhard‐ness measurements indicate no difference in hardness between the grain boundary and the matrix for Cr‐doped NiO, a system in which segregation was detected.
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Bender et al. (1980) studied this question.
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