Abstract
In this study, friction stir processing (FSP) was used to fabricate equiaxed grain structure Al–Mg–0.25Sc alloys with different Mg contents and grain sizes. The grains of the FSP Al–Mg–0.25Sc alloys were refined by Al3Sc phases, Mg atoms, and decreasing FSP heat input. The strength and high-temperature damping value of the Al–Mg–0.25Sc alloy were enhanced by Mg content increase and grain refinement, and the high work hardening ability of the fine grain structure of this alloy with high Mg content enhanced its ductility. The FSP Al–Mg–0.25Sc alloys also exhibited high damping stability due to the pinning effect of the grain boundary in Al3Sc phases. The Al–6.9Mg–0.25Sc alloy with fine grain structure exhibited the best comprehensive performances, including excellent mechanical properties, high damping value, and high damping stability.
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