Abstract
The grain-boundary segregation of Mg atoms in a high-purity Al-8wt% Mg alloy, water quenched from the solution heat-treatment temperature, has been investigated by energy dispersive X-ray microanalysis in a TEM/STEM electron microscope. Many grain boundaries showed a segregation of Mg atoms to a level 2 to 3 times higher than the alloy composition. In the as-quenched state, Mg was uniformly distributed along the grain boundaries, but formed clusters during ageing at room temperature. Hydrogen bubbles were often associated with these Mg-rich regions. Mg-depleted zones were observed adjacent to most boundaries, but in most cases on only one side of the boundary.
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Malis, T., Chaturvedi, M.C. Grain-boundary segregation in an Al-8 wt % Mg alloy. J Mater Sci 17, 1479–1486 (1982). https://doi.org/10.1007/BF00752263
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DOI: https://doi.org/10.1007/BF00752263