Abstract
The inert gas bubbling causes local and rapid heat extraction combined with the convection using a stainless steel porous tube in temperatures above liquidus of the magnesium alloy. In this investigation, the effect of argon inert gas bubbling on the microstructure of AZ91 magnesium alloy has been studied. Different parameters such as the argon gas flow rate of 2, 4L/min; the injection temperature of 610, 620 °C; and the injection duration of 10, 15, 20 s have been investigated. Thermal analysis has been carried out in AZ91 alloy to find the liquidus temperature and the solid fraction at different temperatures during solidification. Microstructural study showed that this semi-solid process changed the microstructure of AZ91 from dendritic to globular state. Image analysis has been used to study the microstructural constituents. Among key parameters studied, the inert gas flow rate had the major effect on the globularity and the grain size. The results showed that at the optimum condition of the gas flow rate of 4 L/min, gas purging temperature of 610 °C, gas purging time of 10 s, the globularity of 0.75, the average α-Mg globule size of 58.4 μm, and the average number of 168 α-Mg globules per unit area were achieved.
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