Abstract
The SEED (Swirled Enthalpy Equilibrium Device) process is the typical high solid fraction (with about 40-60% of solid) rheo-diecast process. The high strength Mg-12Gd-3Y-1Zn-0.4Zr magnesium alloy was successfully produced using SEED process. The microstructure and mechanical properties of rheo-diecast Mg-12Gd-3Y-1Zn-0.4Zr alloy during solution and ageing heat treatment process were studied in this paper. Optical microscopy (OM) and transmission electron microscopy (TEM) were employed to study the evolution of microstructure and mechanical properties. The cast alloy exhibited a microstructure consisting of equiaxed primary solidified grains and together with eutectics. The eutectics were partially dissolved into a-Mg matrix after solution heat treatment. The tensile properties of rheo-diecast Mg-12Gd-3Y-1Zn-0.4Zr alloy were substantially enhanced after T6 heat treatment.
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