Abstract
The effect of friction stir processing (FSP) on the modification of microstructure and mechanical properties of Mg–14Gd–2.3Zn–0.6Zr (wt%) alloy has been investigated. The coarse long period stacking ordered (LPSO) phase at grain boundary in the alloy was successfully broken into fine particles (~1µm) due to the complicated deformation beneath the shoulder and around the pin. The grain size was also significantly refined from 23±4μm to 1.6±0.3µm through dynamic recrystallization (DRX) during FSP. Yield strength of the FSP sample was increased by ~30% probably due to the grain size and LPSO phase refinement as well as fine precipitation around the LPSO phase while the elongation decreased by ~39% maybe because of the heterogeneous microstructure.
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