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The effect of friction stir processing (FSP) on the microstructure, mechanical properties, and damping properties of as-cast Al-5Fe alloy was investigated. The results showed that the needlelike or rod-like eutectic Fe-rich phases were broken into fine particles and homogeneously distributed on the Al matrix with fine equiaxed recrystallized grains with the size of 2–5 μm in the stir zone after FSP. The hardness distribution in the as-cast alloy is highly dispersed. The strength, ductility increased simultaneously after FSP. The increase in the tensile strength values was about 15.6% after FSP. The FSPed alloy exhibited higher elongation to fracture of about 27.5% in comparison with the as-cast sample having only 3.7%. Meanwhile, FSP can obviously improve the damping properties of the Al-5Fe alloy.

Effect of friction stir processing on microstructure, mechanical, and damping properties of Al-5Fe alloy