Effect of spray forming on evolution of microstructure and mechanical behavior of Mg-9Al-1Zn alloy

【摘要】 The cylindrical billet of Mg-9Al-1Zn alloy was produced by spray forming and hot extruded at 698-723 K with an extrusion ratio of 22-1. The microstructural evolution was investigated systematically. The mechanisms of grain refinement,solubility extension of Al and Zn elements in Mg matrix,and the precipitation of the second phase β-Mg17Al12 as well as their effect on the mechanical properties of the Mg-9Al-1Zn alloy were analyzed and discussed. The results show that the spray formed Mg-9Al-1Zn alloy has homogeneous equiaxed fine grains with the average grain size of 17 μm,of which the average grain size is refined further to 5 μm due to dynamic recrystallization during hot extrusion process. The evolution of size,proportion and distribution of β-Mg17Al12 phase was also observed and analyzed. The mechanical properties for the extruded rods are improved remarkably at ambient temperature.更多还原

【Abstract】 The cylindrical billet of Mg-9Al-1Zn alloy was produced by spray forming and hot extruded at 698-723 K with an extrusion ratio of 22-1. The microstructural evolution was investigated systematically. The mechanisms of grain refinement,solubility extension of Al and Zn elements in Mg matrix,and the precipitation of the second phase β-Mg17Al12 as well as their effect on the mechanical properties of the Mg-9Al-1Zn alloy were analyzed and discussed. The results show that the spray formed Mg-9Al-1Zn alloy has homogeneous equiaxed fine grains with the average grain size of 17 μm,of which the average grain size is refined further to 5 μm due to dynamic recrystallization during hot extrusion process. The evolution of size,proportion and distribution of β-Mg17Al12 phase was also observed and analyzed. The mechanical properties for the extruded rods are improved remarkably at ambient temperature.更多还原