grain boundary segregation
grain boundary segregation
A phenomenon where impurities or doped elements in a metal or ceramics are segregated at a crystal grain boundary. The segregation arises in the process of coagulation.
The chemical composition and structure of the grain boundary can greatly affect the macroscopic material properties. The feature of the grain boundary is successfully analyzed by energy-dispersive X-ray spectroscopy (EDS) in an electron microscope.
Figure shows examples of the grain boundary segregation of SiAlON (ceramics) visualized by EDS. The specific elements, such as yttrium, aluminum and oxygen, are seen to be concentrated at the grain boundary.
Fig. HAADF-STEM image and EDS elemental mapping images of SiAlON taken at an accelerating voltage of 200 kV.
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