Grain-boundary segregation in an Al-8 wt % Mg alloy |
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| Authors: | T. Malis M. C. Chaturvedi |
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| Affiliation: | (1) Kingston Laboratories, Alcan International Ltd, Kingston, Ontario, Canada;(2) Present address: Physical Metallurgy Research Laboratory, CANMET, Ottawa, Ontario, Canada;(3) Present address: Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada |
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| 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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