Abstract
The manganese distribution in Cu-0.2at%Mn solid solution alloys after recrystallization at 818 K for 90 min has been measured by atom-probe FIM technique. Even in such a dilute solid solution, a non-uniform distribution on Mn is found. The Mn-rich regions have the size of a few nanometers to several tens of nanometers and the concentration of Mn varies within a wide range. A possible mechanism responsible for the formation of the non-uniform distribution is discussed. Due to the interaction with the grain boundaries and a low diffusivity in copper, Mn atoms are dragged by moving grain boundaries to form Mn-rich regions, which fall behind the moving boundaries and form a non-uniform concentration distribution during recrystallization.
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