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Updated: Jun 16, 2026

Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
Published on: April 22, 2013
Site-specific atomic scale analysis of solute segregation to a coincidence site lattice grain boundary
Mitra L Taheri1, Jason T Sebastian, Bryan W Reed
1Drexel University, Department of Materials Science & Engineering, Philadelphia, PA 19104, USA. mtaheri@coe.drexel.edu
Abstract:
A site-specific method for measuring solute segregation at grain boundaries in an Aluminum alloy is presented. A Sigma 7(Sigma 7=38 degrees 111) grain boundary (GB) in an aluminum alloy (Zr, Cu as main alloying elements) was evaluated using site-specific Local Electrode Atom Probe (LEAP). A sample containing a Sigma 7GB was prepared by combining electron backscatter diffraction (EBSD) and focused ion beam (FIB) milling to locate the GB of interest and extract a specimen. Its composition was determined by LEAP, and compared to a general high angle GB (HAGB). Zr was the only alloying element present in the Sigma 7GB, whereas the general HAGB contained both Cu and Zr. This site-specific LEAP method was found to be an accurate method for measuring GB segregation at specific GB misorientations. The method has advantages over other methods of measuring chemistry at GBs, such as spectroscopy, in that GB structure can be assessed in three dimensions.
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