Abstract
In Mg-Gd-Y-Zn-Zr alloy, the ratio of Zn/(Gd+Y) has a significant influence on the structure and distribution of second phases, which further affects the properties of the alloy. Here we regulated the feature of second phases through altering the Zn/(Gd+Y) ratio with 0.14, 0.21 and 0.25, and analyzed the effects of the Zn/(Gd+Y) ratio on microstructure evolution and mechanical properties of these alloys. The extruded alloys all present bimodal structure, which including the fine grain with diameters below 3 μm and coarse grain with diameters more than 3 μm, and the alloy with Zn/(Gd+Y) ratio of 0.21 shows highest area fraction of fine grain. The sample with Zn/(Gd+Y) ratio of 0.25 shows numerous large block-shaped LPSO phases, while the LPSO phases in the alloys with Zn/(Gd+Y) ratio of 0.14 and 0.21 are much finer. For the alloy with Zn/(Gd+Y) ratio of 0.21, lamellar LPSO phases/SFs exist in the matrix, and some atom clusters exist as well. Extruded alloy with Zn/(Gd+Y) ratio of 0.21 possesses excellent ductility as well as a clear yield drop compared with alloys with higher (0.25) or lower (0.14) Zn/(Gd+Y) ratio. The higher area fraction of fine grain and fine LPSO phases ensure excellent ductility, and the significant solute-dislocation interaction is responsible for a clear yield drop.
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