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

摘要

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 & mu;m 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.

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