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The effect of Sc additions on the microstructure and age hardening behaviour of as cast Al–Sc alloys
Highlights ► The Sc effect on the microstructure and ageing behaviour of Al–Sc alloys is studied. ► Cast into copper mould allows the elimination of solution heat treatment. ► Directly aged as cast alloys exhibits higher hardness and precipitation kinetics. ► Sc addition and optimised ageing result in an increase in Al–Sc mechanical properties.
Abstract The grain refinement effect and the ageing behaviour of Al–0.5wt.% Sc, Al–0.7wt.% Sc, and Al–1wt.% Sc alloys are studied on the basis of optic microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) observations and hardness measurements. In Al–Sc alloys the higher grain refinement is observed for Sc contents greater than 0.5wt.% accompanied by a notorious morphology modification, from coarse columnar grains to a fine perfect equiaxed structure. The as cast structures are characterised by a rich supersaturated solid solution in Sc, that promotes a great age hardening response at 250°C and 300°C. The age hardening curves also demonstrate a low overageing kinetics for all the alloys. Although the higher Sc content in solid solution for the alloys with 0.7 and 1wt.% Sc, the age hardening response of all the Al–Sc alloys remains similar. The direct age hardening response of the as cast Al–0.5wt.% Sc is shown to be greater than the solutionised and age hardened alloy.
The effect of Sc additions on the microstructure and age hardening behaviour of as cast Al–Sc alloys
Highlights ► The Sc effect on the microstructure and ageing behaviour of Al–Sc alloys is studied. ► Cast into copper mould allows the elimination of solution heat treatment. ► Directly aged as cast alloys exhibits higher hardness and precipitation kinetics. ► Sc addition and optimised ageing result in an increase in Al–Sc mechanical properties.
Abstract The grain refinement effect and the ageing behaviour of Al–0.5wt.% Sc, Al–0.7wt.% Sc, and Al–1wt.% Sc alloys are studied on the basis of optic microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) observations and hardness measurements. In Al–Sc alloys the higher grain refinement is observed for Sc contents greater than 0.5wt.% accompanied by a notorious morphology modification, from coarse columnar grains to a fine perfect equiaxed structure. The as cast structures are characterised by a rich supersaturated solid solution in Sc, that promotes a great age hardening response at 250°C and 300°C. The age hardening curves also demonstrate a low overageing kinetics for all the alloys. Although the higher Sc content in solid solution for the alloys with 0.7 and 1wt.% Sc, the age hardening response of all the Al–Sc alloys remains similar. The direct age hardening response of the as cast Al–0.5wt.% Sc is shown to be greater than the solutionised and age hardened alloy.
The effect of Sc additions on the microstructure and age hardening behaviour of as cast Al–Sc alloys
Costa, S. (author) / Puga, H. (author) / Barbosa, J. (author) / Pinto, A.M.P. (author)
2012-06-13
6 pages
Article (Journal)
Electronic Resource
English
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