PRECIPITATION PROCESS OF Al-Sc ALLOYS
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چکیده
Precipitation process in an A1-0.25 wt.%Sc alloy aged at 573 K has been investigated by resistivity and hardness measurements, transmission electron microscopy, and atom-probe field ion microscopy. It was found that the equilibrium A13Sc phase particles precipitate homogeneously from the begining. The particles coarsen following the Lifschitz-Wagner rule after the completion of the nucleation-and-growth stage. Although the precipitation process seemed to be simple, the composition of the precipitate varied with aging time in an unexpected way. The content of the precipitate was measured to be 27 at.%Sc in the initial stage of aging, and increased to 35 at.%Sc.
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تاریخ انتشار 2016