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The effect of small addition of Sc on the microstructural evolution in AI-15Ag alloy was investigated by Monte Carlosimulation and transmission electron microscopy (TEM). Monte Carlo simulation results indicate that Ag clusteringis suppressed by the addition of Sc during the initial ageing stage, and there is a little chemical repulsion between Agatoms and Sc atoms. TEM observations show that the morphology of γ’ precipitation can be modified by the smalladdition of Sc, which does result in a refinement of γ’ precipitates in AI-15Ag-0.2Sc. The mechanism by which traceSc affect the microstructure is to reduce the ledge density of γ’ precipitates.
The effect of small addition of Sc on the microstructural evolution in AI-15Ag alloy was investigated by Monte Carlosimulation and transmission electron microscopy (TEM). Monte Carlo simulation results indicate that Ag clusteringis suppressed by the addition of Sc during the initial aging stage, and there is a little chemical repulsion between Agatoms and Sc atoms. TEM observations show that the morphology of γ ’precipitation can be modified by the smalladdition of Sc, which does result in a refinement of γ’ precipitates in AI-15Ag-0.2Sc. The mechanism by which traceSc affect the microstructure is to reduce the ledge density of γ ’precipitates.